The circuit uses a matched pair of 40 kHz transducer elements to detect movement up to 22 feet away. You may add a relay (not included) to switch higher voltage loads. The unit switches a LED for movement indication. Sensitivity is adjustable via control. Crystal locked circuit for maximum stability. A good circuit for detecting intruders, pets, etc., and then turning on a light, alarm bell, etc. 9 volt battery operation.
Main Board: L: 2-3/4" W: 1-15/16" H: 3/4"
Sensor Board: L: 2-3/4" W: 7/16" H: 3/4"
Requires 9 Volt Battery
Sensitivity user adjustable.
Has a range of 12 to 24 feet.
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