This overview shows the hardware features of the ProXR Lite 1-Channel 20A USB relay board, ideal for computer controlled switching applications. This controller has many hardware features, including an extensive relay control command set, including flashers and timers, built-in A/D converters, and the ability to manually control the on-board relay with the ADC inputs. This is the USB version, but users may change the USB interface to other communication technologies, such as RS-232, Bluetooth, WiFi, Ethernet, and industrial wireless. We have a IoT communication module on the way, keeping ProXR controllers at the top of the list for best relay boards in the world.