Super4 USB Relay Module
USB hub powered, modular relay control board.
Relays (4 x):   5 Amp 30VDC, 5Amp 250V AC

Sealed omron mechanical relays
Command-line application
Standard FTDI USB module (dlls for most OSs)
Power on LED, relay indicator LEDs

The super4 USB relay board is driven over USB directly (not virtual com port). Each board is uniquely identified via its' serial number string, this can be changed using TCTECs RelayMapper application, making replacement of boards easy and programming simple to understand.

User Manual (pdf)

Super4 USB Relay Windows Software

Super4 USB Relay Linux Software

Software Usage Map
USB Cable not included