Product Name: Photo Switch Sensor Input Voltage: DC 12V Max Load Current: 10A Body Size: Approx. 4.3cm x 4.2cm x 3.5cm Usage: Turns off when it's light, turns on when there's no light, no manual operation required. This is a light sensor switch with waterproof processing. The sensor reacts to light and darkness to control the ON/OFF of the switch. LED lights, energy-saving lamps, fluorescent lamps, incandescent lamps, ventilation fan lights, etc., can be used as control targets. Because it is automatic control, it prevents forgetting to turn off, and it is also useful for energy saving. You can use it for automatic control in streetlights, schools, factories, etc. It is also waterproof, so you can use it for boats and a variety of other applications. Wiring Instructions: Connect the black wire and the white wire to the power supply, and connect the red wire and the white wire to the load (electric lamp, etc.). Incorrect wiring will result in improper function. Please confirm the product and connect it correctly. Although this product can be used either upwards or downwards, ensure the sensor can accurately judge the light and darkness. Color: White + Blue Material: Plastic + Metal Package Contents: 4 x Switch Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error margin is +/- 1-3 cm.