Describtion: FarmGuard External Wireless Security Transmitting range - 400m (extendable to 1mile with antennae below) The sensor (on the right of the picture) is fully weatherproof and battery-powered, allowing you to position it virtually anywhere without having to run any cables. Its 30m beam will detect the passage of any vehicle or pedestrian and send a signal back to the receiver in the house, where a buzzer will sound.Sensor batteries (a pair of AAs) last 12 ? 18 months in most applications, and take only a moment to change. The receiver simply plugs into any mains socket, and can be moved around the house as required. ?
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