Feature: Saving energy, long life, safe and reliable. Using three-wire system, compatible with resistance. Control of the lighting time according to the illumination value of the environment automatically. The internal environment with automatic illumination detection circuit, shut down during the day and open during the night automatically. Suitable for the LED lighting and outdoor monitoring, advertising gallery, garden lights and other automatic switching lights control. Specification: Model: NK-BB/F50 Color: Black Voltage range: 12V 24V 36V 48V Supply voltage: 8V to 50VDC (module normal operating voltage range) Standby current: 0.3ma (silent state) Output power: high power. Load current 3.5A. The pressure drop is negligible. Environment temperature: 25 ~ 70 Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Included: 1x Photocell Switch