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Each AVTECH Motion Sensor is a movement sensing device specially equipped with additional electronics that allow it to interface with any compatible Room Alert ID box. The motion sensor is powered by a 12V DC power supply and is designed to detect movement up to 35' away with a cone coverage of approximately 84 degrees wide.
This is an instant 'Plug & Play' sensor via one of the switch sensor channels on the back of any compatible Room Alert ID box. Cable distance can be extended from the standard 25' to approximately 900' by using standard speaker wire, twisted pair or any reliable low voltage 2-wire cable.
http://agoo.com.vn/cam-bien-chuyen-dong/avtechs-motion-sensor.html
