ALL RELAYS ARE HERMETICALLY SEALED, Relay Controller Requires +12VDC Power Supply, Photos May Show Options or Accessories Not Included with Relay Controller.  USB Specification Prohibits Relay Controllers from Being USB Bus Powered due to Surge Currents.  NCD will NOT Design/Manufacture a Mechanical Relay Controller that is USB Bus Powered, Please Be Cautious of Any Manufacturer who Offers such a Device.