8-70v blue lcd lead acid lithium battery capacity indicator digital voltometer tester 40ja

characteristics: ootdty display: power, voltage, closed, key for the barrel. voltage range: 8-70v, products are displayed based on voltage, voltage fluctuations, power meter will be followed as voltage fluctuations (translated with google translate) it comes with refuelling security, can be used for effective use) simple installation: red wire: power +; black wire: feed instructions: 1) power off the indicator 2) hold kdn key 3) power on the indicator 4) release kdn key, then the scree