This unit allows for a low voltage power supply to be switched on and off at it's two outputs. Each output is independently controllable in the Growtronix software. For example you could plug in a 12v power supply into the input then plug the output into a 12v solenoid valve to be able to control (open and close) the valve. 

Max Current: 1 Amp
Max Voltage: 48 Volts (AC or DC)
Input Connector: Screw terminal
Output Connector: Screw terminals
Network Current Usage: 40 mA per output (only when output is turned on)

A power supply is not included with this product because the power supply that you'll use is dependent upon the requirement.