Esumsky DC 12V Auto On Off Photocell Light Switch Photoswitch Light Sensor Switch Using photoresistor induction light intensity, built-in relay, direct control of the load With a potentiometer sensitivity adjustment, by adjusting the potentiometer, set the start relay valve value, when the light on the threshold, relay module pull-in, dark at the threshold, the relay release, so pick up normally open with the public is the control of the switch during the day, pick up normally closed with the public is to control the switch in the evening. Working voltage 12v. Output forms: direct connect AC 250V 10A or DC 30V 10A Sesor Size : 60 x 20.5mm/ 2.4 Equipped with four fixed bolt hole, convenient installation. Small board PCB size: 5 cm x 2.6 cm