4 Channel USB Powered Relay Module is great for controlling your devices through USB without any USB protocol knowledge. This modules plugs in to your design seamlessly. Individual relays can be controlled by simple commands. The relays are powered from USB bus so it is important to connect this board directly to a PC or to a powered hub.
It has one on board 5V DC relays that can switch up to 10A load.The relays are controlled by USB capable Microchip PIC Microcontroller (PIC18F14K50) and comes with built in firmware that supports simple commands to control relays and read relay status.