Editorial Review
The Lorex SG21CD7481UQ-A80 21-inch Color 2-page/8-channel Observation System with Built-in 4-channel DVR and 1 Camera provides convenience, versatility, and quality in a robust and complete system. This system allows you to view up to eight camera locations in real-time sequentially in full-screen, or simultaneously in quad or PIP (picture-in-picture) modes. The included camera has a built-in motion-sensing function so you won't miss any action, while the built-in DVR (digital video recorder) allows 100-hours of real-time and 2,250-hours of total recording. Featuring password security protection, remote control, and other features the Lorex SG21CD7481UQ-A80 is a complete, self-contained observation system perfect for everything from the home or business applications, to professional security installations.
The SG21CD7481UQ-A80's 21-inch color picture-tube monitor can be operated via its built-in main panel or via an included remote control. Built inside a durable metal cabinet housing, this monitor includes eight DIN/BNC (Bayonet Neill-Concelman, RF-type) composite video inputs, and eight RCA audio inputs. Also included are eight alarm inputs with one alarm output for connecting external alarm devices. The SG21CD7481UQ-A80 monitor features on-screen display of date/time/camera, and a stand-by switch that allows recording to occur while monitor is off. Multi-voltage compatible, the SG21CD7481UQ-A80's monitor runs on 90 to 250-volts of power, achieves an high horizontal resolution of 480 TVL (TV lines) at up to 30 fps (frames-per-second), and has an operating temperature of 0 to 40 degrees Celsius.
The camera that comes with the SG21CD7481UQ-A80 utilizes a 0.25-inch color CCD (charge-coupled device) image sensor with a 3.6mm fixed lens. Powered from the monitor via the connecting cable, this camera achieves a horizontal resolution of 330 TVL and can receive a usable picture at a minimum illumination level of 0.5 Lux for very low-light condition viewing. Constructed of a durable white ABS (Acrylonitrile Butadiene Styrene) plastic, this unit features an automatic electronic shutter with speeds ranging from 1/60 to 1/100,000 of a second, and a PIR (passive InfraRed) motion sensor that alerts you of camera activity. The SG21CD7481UQ-A80's camera comes with its own 63-foot connection cable allowing you to install it virtually anywhere, and can operate in temperatures ranging from -20 to 50 degrees Celsius.
The Lorex SG21CD7481UQ-A80's built-in DVR utilizes a modified MJPEG video compression, and achieves a maximum video resolution of 720 by 576 effective pixels and recording resolution of 640 by 272 effective pixels. This unit includes a built-in video-capture card and USB output for Internet remote-security monitoring. The SG21CD7481UQ-A80 provides you with date and time or full-list searching, and password protection for security purposes. This DVR has a built-in 80 GB (Gigabyte) IDE-type (Integrated Drive Electronics) HDD that allows up to 100-hours of real-time and 2,250 hours of total recording. This unit features three adjustable video-quality settings and four selectable recording modes, and a 1,000-event alarm history log. For additional alarm or control functionality, the SG21CD7481UQ-A80 has a RS-232 connection that allows you to connect an alarm-terminal block and remotely control the system via a PC, and a slave HDD input for additional storage.
Technical Features:
- Camera lenses: 3.6mm fixed
- Image sensor: 0.25-inch color CCD
- Resolution: monitor 480 TVL up to 30 fps, camera 330 TVL
- Operating temperature: -20 to 50 degrees Celsius for camera, 0 to 40 degrees Celsius for monitor
- Compression format: modified MJPEG
- Digital storage space: 80 GB via internal IDE-type HDD
- Camera dimensions: 2.5 x 3 x 2 inches (W x D x H)
Designed primarily for indoor use, the Lorex SG21CD7481UQ-A80 offers you everything you need in a security surveillance system. Though only one camera is included, the SG21CD7481UQ-A80 allows up to eight cameras to be controlled, viewed, and recorded all by a single unit. While the monitor for this unit is an eight-channel system, the DVR is only a four-channel system. Users should note that the CCD image sensor in the camera may become permanently damaged if exposed to long hours of direct sunlight or halogen light, so the camera should not be mounted or pointed directly at the sun or other bright-light sources.
About Surveillance Camera Technical Features
Lux rating is the measurement used to indicate how sensitive a camera is to light, and stands for the level of light reflected off a piece of paper by a candle from one meter away. Thus a sensitivity of three Lux would mean a camera could generate an acceptable picture of a piece-of-paper-sized object that was illuminated by the equivalent of three candles from one meter away. The lower the Lux level, the better the camera's ability to work in low-light conditions. The camera's resolution should be greater than or equal to the resolution supported by the system's recorder or monitor. The S/N, or signal to noise ratio, is an important measure of a camera's quality. A poor camera, low-light conditions or poor wiring causes "noise" which consumes processing power and disk space. A camera with a wide dynamic range is ideal, especially for recording areas in which both indoor and outdoor light are present. CCD (charge-coupled device) sensors provide high-quality images that are less susceptible to noise. CMOS (complimentary metal-oxide semiconductor) sensors offer less image quality, but are usually more cost-effective and energy efficient.
What's in the Box
Color quad monitor (built-in DVD), camera, cable, camera bracket, hard disk drive, 2 keys for cartridge, Internet security software, and owner's manual.
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