... , it can charge ipad, iphone as well. Usage 1. Power on: press "power key" about 2 minutes, or during charging, LCD light, shows ... voltage and USB output. 2. Voltage selection: long press "the power key", LCD will show voltage value, flash among 5V, 7.4V ... wire can select voltage again.4. Power off: while not charging, press the "power key", it will power off, within 10 minutes, it has ...