Description: 1. sensor uses HX1838, high sensitivity 2. Operating voltage 5V 3 .Output Type: Digital Output 4 .has a fixed bolt holes for easy installation 5. small PCB board size: 1.9cm * 1.4cm 6. power indicator (red) Two small plate interface specification (3-wire) 1 VCC external 5V 2 GND GND External 3 DO microcontroller IO port access
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