* The USB port is for firmware update
* Power consumption refers to the controller’s power consumption at idle state — the controller draws about 200mA to 300mA, so that times 5V is 1 to 1.5 Watt. The maximum output current per zone refers to how much current it’s able to switch per zone. The total power consumption obviously increases depending on how many active zones you have because solenoids draw power as well. That is NOT included in the controller’s power consumption at idle state.
* With respect to the controller’s power consumption, at 5V input voltage or 12V, the current draw is the same as the controller uses linear regulator.