ES-15 (Ver.2)      Crystal-lock Ultrasonic Motion Detector      
                                       (DC 12V)   (relay contact : 2A) 

 
A pair of 40 KHz ultrasonic transducers detects moving objects or human bodies up to 10 meters. When any object is found moving  in front of the transducers, the detector responds by energizing a miniature relay (LED on) for about 2 seconds. This will repeat continuously until the object stops moving. The transducers are mounted off board via 2 pairs of cables (as shown in the picture )    Plastic enclosure provided for the main board   

Applications :  Add-on motion detector for existing security alarm system,  proximity switch, visitor chime (when used with door chime), . .