Features This board is designed with square type-b USB interface, stable connection. It uses imported high-performance USB control chip. High quality relay and dedicated relay driven ULN2803 chip ensure relay to work more stably. There are two flexible and convenient power input methods, power socket and terminal. After connecting the power supply, relay can maintain the setting state even if the computer is power off or USB is disconnected from computer. Description: This computer USB control switch features high quality for the imported high-performance USB control chip, and Stable connection and performance. It is flexible and convenient for power socket and terminal input methods.There is no need of any driver, and you can plug and play. It is convenient and easy to use for WIN 7, XP, 32 bit, 64 bit system. It is widely applied in smart switch control for home, hotel, electric appliance, greenhouses, market, company, factory, and time control for Internet cafe, karaoke, IOT, industrial control equipment, test equipment power supply, street lamp, smart management, centralized power management, etc. Specification: Input Voltage: DC 12 V Input Current: >300mA Wiring Method: NC/COM/NO Relay Capacity: AC 250V, 10A and DC 30V, 10A Weight: 112g / 4oz (approx.) Package list: 1 × Smart Controller Note: Please check first and make sure you know how to use it.