ITEM NAME:DC 12V Photoelectric Switch Sensor Relay Module 50mmx25mm w 2 Cable S3J6 DC 12V Photoelectric Switch Sensor Relay Module 50mmx25mm w 2 Cable S3J6 Indicator light: one green for switch, red one for power. Built in a potentiometer for sensitivity control. The module with Photoelectric Switch Sensor Relay Module, can be use in street lamp ,automation equipment, detecting the brightness, etc. Product Name : Photoelectric Switch Sensor Relay Module Mode : Light Actuation Mode Working Voltage : DC 12V Relay Loading Voltage : AC 250V 10A,DC30 V 10A PCB Board Size : 50 x 25mm/ 2" x 0.98" (L*W) Sensor Size : 60 x 20.5mm/ 2.4" x 0.8" (L*W) Cable Size : 50cm/ 20" Mounting Hole Size : 3mm/ 0.12" Material : Electronic Components, Plastic Package Content : 1 x Photoelectric Switch Sensor Relay Module Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm..Indicator light: one green for switch, red one for power. Sensor Size : 60 x 20.5mm/ 2.4" x 0.8" (L W).