Network Systems
? Third-party network cameras supported
? Up to 12 Megapixels resolution recording
? Support 2-ch HDMI, 2-ch VGA, HMDI1 at up to 4K(3840x2160)
resolution
? Up to 64 IP cameras can be connected with 320M
incoming bandwidth
? Up to 8 SATA interfaces
? Support HDD hot swap with RAID0,1,5,6,10 storage
scheme configurable
?Support various VCA detection alarm and VCA search
?Support H.265/H.264/MPEG4 video formats
UTP CAT 5E, 305 meters,Core diameter: 0.53mm,OFC,CM,white
UTP CAT 5E, 305 meters,Core diameter: 0.45mm,OFC,CMX,gray
UTP CAT 6, 305 meters,Core diameter: 0.565mm,OFC,CM,orange
UTP CAT 5E, 305 meters,Core diameter: 0.5mm,OFC,CM,gray
? Third-party network cameras supported
? Up to 12 Megapixels resolution recording
? Support 2-ch HDMI, 2-ch VGA, HMDI1 at up to 4K(3840x2160)
resolution
? Up to 32 IP cameras can be connected with 320M
incoming bandwidth
? Up to 8 SATA interfaces
? Support HDD hot swap with RAID0,1,5,6,10 storage
scheme configurable
?Support various VCA detection alarm and VCA search
?Support H.265/H.264/MPEG4 video formats
? Third-party network cameras supported
? Up to 12 Megapixels resolution recording
? Support 1-ch HDMI, 1-ch VGA, HMDI at up to 4K(3840x2160)
resolution
? 32-ch network cameras can be connected with
160M/256M incoming bandwidth
? Up to 4 SATA interfaces
? Plug & Play with up to 16 independent PoE network
interfaces
? Support dual-os to ensure high reliablility of system
running
?Support various VCA detection alarm and VCA search
?Support H.265/H.264/MPEG4 video formats
? Third-party network cameras supported
? Up to 12 Megapixels resolution recording
? Support 1-ch HDMI, 1-ch VGA, HMDI at up to 4K(3840x2160)
resolution
? 16-ch network cameras can be connected with
160M/256M incoming bandwidth
? Up to 4 SATA interfaces
? Plug & Play with up to 16 independent PoE network
interfaces
? Support dual-os to ensure high reliablility of system
running
?Support various VCA detection alarm and VCA search
?Support H.265/H.264/MPEG4 video formats
Third-party network cameras supported
? Up to 12 Megapixels resolution recording
? Support 1-ch HDMI, 1-ch VGA, HMDI at up to 4K(3840x2160)
resolution
? 16-ch network cameras can be connected with
80M/160M incoming bandwidth
? Up to 2 SATA interfaces
? Support dual-os to ensure high reliablility of system
running
?Support various VCA detection alarm and VCA search
?Support H.265/H.264/MPEG4 video formats
Third-party network cameras supported
? Up to 12 Megapixels resolution recording
? Support 1-ch HDMI, 1-ch VGA, HMDI at up to 4K(3840x2160)
resolution
? 8-ch network cameras can be connected with
80M/160M incoming bandwidth
? Up to 2 SATA interfaces
? Support dual-os to ensure high reliablility of system
running
?Support various VCA detection alarm and VCA search
?Support H.265/H.264/MPEG4 video formats
16-ch
Main stream: 50 fps (P) / 60 fps (N)
Sub-stream: 50 fps (P) / 60 fps (N) Synchronous HDMI and VGA Output 1920 ? 1080p Resolution 160Mbps/80Mbps 19-inch rack-mounted 1U chassis
Sub-stream: 50 fps (P) / 60 fps (N) Synchronous HDMI and VGA Output 1920 ? 1080p Resolution 160Mbps/80Mbps 19-inch rack-mounted 1U chassis
Video Input and Transmission
? Up to 32-ch ONVIF conformant IP cameras input (max. incoming bandwidth: 160 Mbps)
? Live view of the connected camera at up to 6 MP resolution
Compression and Recording
? H.264+ compression improves encoding efficiency by up to 50% and reduces data storage costs
? Full channel recording at up to 6 MP resolution
? Export with AVI format
Video Output
? HDMI output and VGA output at up to 1920?1080p resolution
Storage and Playback
? Two SATA interfaces (up to 4TB of capacity per HDD)
? Up to 16-ch synchronous playback at 4CIF resolution
? Smart search for efficient playback
? USB 3.0 provides high-speed file transfer and backup
Smart Function
? Supports multiple VCA(Video Content Analytics) events for IP cameras
Network & Ethernet Access
? Hik-Connect for easy network management
? Gigabit Ethernet network interface
8-ch
Main stream: 50 fps (P) / 60 fps (N)
Sub-stream: 50 fps (P) / 60 fps (N) Synchronous HDMI and VGA Output 1920 ? 1080p Resolution 80Mbps/80Mbps 19-inch rack-mounted 1U chassis
Sub-stream: 50 fps (P) / 60 fps (N) Synchronous HDMI and VGA Output 1920 ? 1080p Resolution 80Mbps/80Mbps 19-inch rack-mounted 1U chassis
? Third-party network cameras supported
? Up to 6 Megapixels resolution recording
? HDMI and VGA output at up to 1920?1080P
resolution
? 8-ch network cameras can be connected with
40M/80M/160M incoming bandwidth
? Up to 2 SATA interfaces
? Plug & Play with up to 4 independent PoE network
interfaces
? Support network detection, including network delay,
packet loss, etc
? Third-party network cameras supported
? Up to 6 Megapixels resolution recording
? HDMI and VGA output at up to 1920?1080P
resolution
? 4-ch network cameras can be connected with
40M/80M/160M incoming bandwidth
? Up to 2 SATA interfaces
? Plug & Play with up to 4 independent PoE network
interfaces
? Support network detection, including network delay,
packet loss, etc
100Mbps Bit Rate Input Max (up to 16-ch IP video), 1 SATA interface, mini 1U case
50Mbps Bit Rate Input Max (up to 8-ch IP video), 1 SATA interface, mini 1U case
Third-party network cameras supported
H.264+ compression effectively reduces the storage space and costs by up to 50%,?Full channel recording at up to 4 MP resolution
HDMI and VGA output at up to 1920*1080P resolution
HDD quota and group management
4 independent network interfaces for built-in switch
Connectable to the third-party network cameras
Up to 8 network cameras can be connected
H.264+ compression effectively reduces the storage space and costs by up to 50%
Full channel recording at up to 4 MP resolution
HDMI/VGA output at 1080p resolution
Up to 2-ch synchronous playback at 4 MP resolution or 4-ch at 1080p resolution
1 SATA hard disks can be connected with 6TB capacity
Supports multiple VCA(Video Content Analytics) events detection
Smart search for the selected area in the video
and smart playback to improve the playback efficiency
One-key operation: automatically search, modify and add IP cameras after device is activated
100 Mbps Ethernet network interface
? Up to 5 megapixel high resolution
? Max. 2944 ? 1656@20fps
? 2.8 mm/4 mm/6 mm/8 mm/12 mm fixed lens, optional
? H.265, H.265+, H.264+, H.264
?120dB Wide Dynamic Range
? 3D Digital Noise Reduction
? DC12V & PoE (802.3af)
? IR range: up to 30 m
? Support on-board storage, up to 128 GB
? IP67, IK10
? Up to 2 megapixel high resolution
? Max. 1920 ? 1080 @30fps
? 2.8 mm/4 mm/6 mm/8 mm/12 mm fixed lens, optional
? Powered by Darkfighter
? H.265, H.265+, H.264+, H.264
? 120dB Wide Dynamic Range
? 3D Digital Noise Reduction
? DC12V & PoE (802.3af)
? IR range: up to 30 m
? Support on-board storage, up to 128 GB
? IP67, IK10
? Up to 5 megapixel high resolution
? Max. 2944 ? 1656@20fps
? 2.8 mm/4 mm/6 mm/8 mm/12 mm fixed lens, optional
? H.265, H.265+, H.264+, H.264
?120dB Wide Dynamic Range
? 3D Digital Noise Reduction
? DC12V & PoE (802.3af)
? IR range: up to 30 m
? Support on-board storage, up to 128 GB
? IP67
? Up to 2 megapixel high resolution
? Max. 1920 ? 1080 @30fps
? 2.8 mm/4 mm/6 mm/8 mm/12 mm fixed lens, optional
? Powered by Darkfighter
? H.265, H.265+, H.264+, H.264
? 120dB Wide Dynamic Range
? 3D Digital Noise Reduction
? DC12V & PoE (802.3af)
? IR range: up to 30 m
? Support on-board storage, up to 128 GB
? IP67
? 1/3" Progressive Scan CMOS
? 2688 ?1520@30fps
? 2.8 to 12 mm varifocal lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.018 Lux @ (F1.6, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67, IK10
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/2.8" Progressive Scan CMOS
? 1920 ?1080@30fps
? 2.8 to 12 mm varifocal lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.018 Lux @ (F1.6, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67, IK10
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/3" Progressive Scan CMOS
? 2688 ?1520@30fps
? 2.8 to 12 mm varifocal lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.018 Lux @ (F1.6, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67, IK10
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/2.8" Progressive Scan CMOS
? 1920 ?1080@30fps
? 2.8 to 12 mm varifocal lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.018 Lux @ (F1.6, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67, IK10
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/3" Progressive Scan CMOS
? 2688 ?1520@30fps
? 2.8/4/6/8mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.018 Lux @ (F1.6, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/2.8" Progressive Scan CMOS
? 1920 ?1080@30fps
? 2.8/4/6/8mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.028 Lux @ (F2.0, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/2.8" Progressive Scan CMOS
? 1920 ?1080@30fps
? 2.8/4/6/8mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.028 Lux @ (F2.0, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/3" Progressive Scan CMOS
? 2688 ?1520@30fps
? 2.8/4/6/8mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.018 Lux @ (F1.6, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/2.8" Progressive Scan CMOS
? 1920 ?1080@30fps
? 2.8/4/6/8mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.028 Lux @ (F2.0, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67, IK10
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
? 1/2.8" Progressive Scan CMOS
? 1920 ?1080@30fps
? 2.8/4/6/8mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.028 Lux @ (F2.0, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67, IK10
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
BLC/3D DNR/ROI
? IP67
? Built-in micro SD/SDHC/SDXC card slot,
up to 128 GB
? 3-Axis adjustment
? 1/3" Progressive Scan CMOS
? 2560 ? 1440@30fps
? 2.8/4/6/8 mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON),
0.018 Lux @ (F1.6, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
K
? 1/2.8" Progressive Scan CMOS
? 1920 ?1080@30fps
? 2.8/4/6/8mm fixed lens
? Color: 0.01 Lux @ (F1.2, AGC ON), 0.028 Lux @ (F2.0, AGC ON), 0 Lux with IR
? H.265+, H.265, H.264+, H.264
? Three streams
? 120dB WDR
? 2 Behavior analyses, and face detection
? BLC/3D DNR/ROI/HLC
? IP67
? Built-in micro SD/SDHC/SDXC card slot, up to 128 GB
? 3-Axis adjustment
Key Features
? Up to 2.0 megapixel (1920 ? 1080) high
resolution
? Built-in Micro SD/SDHC/SDXC card slot, up to
128 GB
? Great performance and long lifespan Infrared
LED, Approx. 20 to 30 meters IR range
? IR cut filter with auto switch
? DC12V & PoE
? The bit rate mode: CBR and VBR
? Wide Dynamic Range
? 3D Digital Noise Reduction
? Backlight Compensation
? Auto Electronic Shutter
? Language: Portuguese, English and Chinese
? IP67 weather-proof protection
? IK10 vandal-proof protection
? Mobile Monitoring via Hik-Connect or
iVMS-4500
2 megapixel high resolution
? 2.8-12mm vari-focal lens
? 3D DNR & DWDR & BLC
? IP67 rating
? IR range: up to 30m
? Audio and alarm optional
? True day / night
Key features
Up to 2.0 megapixel (1920 ? 1080) resolution
Standard video compression with high compression ratio, ROI (region of interest) encoding
Progressive scan CMOS, capture motion video without incised margin
Support dual stream, and the sub-stream for mobile surveillance
High-performance and long service life infrared LED, Approx. 10 to 30 meters IR range
IR cut filter with auto switch
PoE (Power over Ethernet)
Built-in Micro SD/SDHC/SDXC card slot, up to 128 GB
Impact Protection: IEC60068-2-75 test, Eh, 20J; EN50102, up to IK10
Other functions: rotate mode, alarm, mirror, reset button, etc
Support intrusion detection, line crossing detection
Support VCA, which is compatible with NVR for the second time of video searching and analysing
Read more: https://www.mobile-harddisk.nl/product/9390/hikvision-ds-2cd2120f-i-28mm-2mp-ir-fixed-dome-camera.html?language=en
Key Features
? Up to 2 megapixel (1920 ? 1080) resolution
? Standard video compression with high compression ratio, ROI (region of interest) encoding
? Progressive scan CMOS, capture motion video without incised margin
? Support dual stream, and the sub-stream for mobile surveillance
? High-performance and long service life Infrared LED, Approx. 20 to 30 meters IR range
? IR cut filter with auto switch
? PoE (Power over Ethernet)
? Ingress Protection level: IP67
? Electronic shutter for different surveillance environments
? Other functions: alarm, reset button, mirror, etc
? Support intrusion detection and line crossing detection
? Support VCA, which is compatible with NVR for the second time of video searching and analysing
Key Features
? Up to 2 megapixel (1920 ? 1080 @ 30 fps) resolution
? Standard video compression with high compression ratio, ROI (region of interest) encoding
? Progressive scan CMOS
? Built-in Micro SD/SDHC/SDXC card slot, up to 128 GB
? IR range approx. 10 meters
? Two-way audio
? Built-in microphone and speaker
? Support Wi-Fi, support WPS configuration with one touch
? Support PIR(Passive Infrared Detection)
? IR cut filter with auto switch
? Support PoE(802.3af)
? 3D digital Noise Reduction
? Support dual stream, and the sub-stream for mobile surveillance
? Integrated mount for easy installation
? Support Backlight Compensation, Digital Wide Dynamic Range, Auto-electronic shutter and so on
? Other functions: heartbeat, mirror, reset button, etc
? Support intrusion detection and line crossing detection
? Support VCA, which is compatible with NVR for the second time of video searching and analysing
WIFI PT camera, 2 megapixel resolution (1920X1080), Two-way audio, Physical privacy mask, Auto PT tracking, 10 meters IR range (for night use), upto 128G SD card supported
Indoor Internet Camera,2 megapixel resolution; 15fps, 2-way audio. 5m IR distance. Support one-key configuration for Wi-Fi; motion detection and alarm review. Light and handy device, easy for installation. Support video alarm service for mobile phone and Web. Upto 128G SDcard supported
Indoor Internet Camera,1 megapixel resolution; 15fps, 2-way audio. 5m IR distance. Support one-key configuration for Wi-Fi; motion detection and alarm review. Light and handy device, easy for installation. Support video alarm service for mobile phone and Web. Upto 128G SDcard supported
Hikvision DS-2TS03 handheld observational thermal monocular is equipped with a
384? 288 infrared detector and a 1024? 768 OLED display. It supports functions of
observation, hot spot tracking, distance measurement, Wi-Fi hot spot, and so on. The
high-sensitivity built-in thermal detector provides you with clear view even in total
darkness.
Key Features
? 384 ? 288 resolution, high sensitivity detector
? DDE (Digital Detail Enhancement) technique
? 3D DNR, adaptive AGC (Automatic Gain Control)
? 1024 ? 768 resolution 0.39-inch OLED display
? Built-in rechargeable Li-ion battery
? Up to five hours continuous running (with GPS function and Wi-Fi hot spot
function off)
? Small in size and light in weight
Key Features
l 384 ? 288 resolution (thermal), and 1080P resolution (optical)
l DDE (Digital Detail Enhancement) technique
l 3D DNR, adaptive AGC (Automatic Gain Control)
l 320? 240 resolution 3.5?? LCD touch display
l Built-in rechargeable Li-ion battery
l Up to four hours continuous running
Hikvision DS-2TD8135-150C2F Thermometric Thermal & Optical Bi-spectrum Network Stable PTZ Camera (also called
Thermal & Optical Bi-spectrum Network Stable Positioning System) is applied to extreme low light condition or scenario
with strong light interference in airport, port, oil field, boundary, forest, military area, and so on.
Smart Function (Thermal Imaging)
? Leading image processing technology: Adaptive AGC, DDE, 3D DNR, NETD < 50mk(@25?C,F#=1.0)
? Powerful behavior analysis algorithm: Line crossing, Intrusion, Audio exception, Region Entrance & Exit.
? Advanced Fire Detection Algorithm.
? Panorama Tracking, Event Tracking, Multi-Scenario Patrol Tracking and so on.
? Thermal and Optical Bi-spectrum linked Smart Tracking.
Thermal Imaging Module Function
? Support auto focus.
? 384?288 resolution, high sensitivity sensor, support contrast adjustment.
? Support shutter adjustment in various modes.
? 3D DNR, 15 palettes of color adjustable, image detail enhancement.
? Support mirror image, digital zoom X2, X4, X8, X16, and local output
Hikvision DS-2TD8135-100C2F Thermometric Thermal & Optical Bi-spectrum Network Stable PTZ Camera (also called
Thermal & Optical Bi-spectrum Network Stable Positioning System) is applied to extreme low light condition or scenario
with strong light interference in airport, port, oil field, boundary, forest, military area, and so on.
Smart Function (Thermal Imaging)
? Leading image processing technology: Adaptive AGC, DDE, 3D DNR, NETD < 50mk(@25?C,F#=1.0)
? Powerful behavior analysis algorithm: Line crossing, Intrusion, Audio exception, Region Entrance & Exit.
? Advanced Fire Detection Algorithm.
? Panorama Tracking, Event Tracking, Multi-Scenario Patrol Tracking and so on.
? Thermal and Optical Bi-spectrum linked Smart Tracking.
Thermal Imaging Module Function
? Support auto focus.
? 384?288 resolution, high sensitivity sensor, support contrast adjustment.
? Support shutter adjustment in various modes.
? 3D DNR, 15 palettes of color adjustable, image detail enhancement.
? Support mirror image, digital zoom X2, X4, X8, X16, and local output
Hikvision DS-2TD8135-75C2F Thermometric Thermal & Optical Bi-spectrum Network Stable PTZ Camera (also called
Thermal & Optical Bi-spectrum Network Stable Positioning System) is applied to extreme low light condition or scenario
with strong light interference in airport, port, oil field, boundary, forest, military area, and so on.
Smart Function (Thermal Imaging)
? Leading image processing technology: Adaptive AGC, DDE, 3D DNR, NETD < 50mk(@25?C,F#=1.0)
? Powerful behavior analysis algorithm: Line crossing, Intrusion, Audio exception, Region Entrance & Exit.
? Advanced Fire Detection Algorithm.
? Panorama Tracking, Event Tracking, Multi-Scenario Patrol Tracking and so on.
? Thermal and Optical Bi-spectrum linked Smart Tracking.
Thermal Imaging Module Function
? Support auto focus.
? 384?288 resolution, high sensitivity sensor, support contrast adjustment.
? Support shutter adjustment in various modes.
? 3D DNR, 15 palettes of color adjustable, image detail enhancement.
? Support mirror image, digital zoom X2, X4, X8, X16, and local output
Smart Function (Thermal Imaging)
l Leading image processing technology: Adaptive AGC, DDE, 3D DNR, NETD < 40mk (@25?C, F#=1.0)
l Smart tracking: Panorama tracking, Event tracking and Multi-scene patrol tracking
l Smart tracking linkage: thermal view and optical view
l Powerful behavior analysis algorithm: Line crossing, Intrusion, Region Entrance & Exit
l Reliable temperature exception alarm function
l Advanced fire detection algorithm
Thermal Imaging Module Function
l 640*512 resolution, high sensitivity sensor, support contrast adjustment
l Support shutter adjustment in various modes
l 3D DNR, 15 palettes of color adjustable, image detail enhancement
Smart Function (Thermal Imaging)
l Leading image processing technology: Adaptive AGC, DDE, 3D DNR, NETD < 40mk (@25?C, F#=1.0)
l Smart tracking: Panorama tracking, Event tracking and Multi-scene patrol tracking
l Smart tracking linkage: thermal view and optical view
l Powerful behavior analysis algorithm: Line crossing, Intrusion, Region Entrance & Exit
l Reliable temperature exception alarm function
l Advanced fire detection algorithm
Thermal Imaging Module Function
l 640*512 resolution, high sensitivity sensor, support contrast adjustment
l Support shutter adjustment in various modes
l 3D DNR, 15 palettes of color adjustable, image detail enhancement