The Yocto-Relay device contains two USB-driven miniature unipolar relay switches. You can drive by software each relay input to one of two individual outputs (computer-driven switch). To make it easier to test your project, four leds positioned on the front side of the connector show the output currently active for each relay. 

This product is designed to stand up to 55V and a current of 2A, but no more than 60W. Be aware that using a relay to drive inductive loads (motors, transformers) may lead to accelerated aging of the relay. Please refer to the documentation for hints on reducing this type of problems.