Monitor your batteries charge, with this petite battery meter. Designed to be able to go anywhere, you can pop it in your boats glove box, or a utility storage pocket, to have on hand always. Nothing says a bad trip, like not having the clue, your about to run out of juice. Monitors the voltage level and state of charge Works on any12 volt battery LCD display Compact frame Easy To Store LEDs That Indicate Full, 2/3, 1/3 or zero (0) State Of Charge