Numato Lab 4 Channel USB Relay Module is great for controlling your devices through USB without any USB protocol knowledge. This module plugs into your design seamlessly. Individual relay can be controlled by simple commands. Numato's URMC4 4 Channel USB Relay Module provides exceptional value for money. It has four onboard 12V/24V DC relays that can switch up to 7A load. It comes with built-in firmware that supports simple commands to control relays and read relay status. The board, when attached to a PC/Laptop shows up as a serial port and all you need to control the board is a serial terminal application like HyperTerminal or Putty.
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