Watch the product video here: http://www.youtube.com/watch?v=o82buWfITPI&feature=youtu.be Description: This USB/Wireless Relay Module allows computer control switching of external devices by using the USB port of your computer! Meanwhile, It has a wireless extension port, can work with XBEE or Bluetooth Bee or Wifly Module, which mean now you can control your device by zigbee or Bluetooth or Wi