This handy little device allows you to charge your mobile phone, USB keychain camera or any other 5V USB device at the field with a 2~6S Lipoly battery. It uses the balance plug (JST-XH) from your Lipoly battery for power. This device also doubles as a cell voltage checker thanks to the on-board LCD display. Low-voltage input protection will shut this device down should the input source voltage drop below 3V. This prevents critical over-discharging of your input battery.