Easy installation;Sufficient accessories;No additional needed;Time saving and effortless;New RL-BI004 Battery Indicator with Hour meter. It can work on lead acid battery.It has a battery indicator system and timing system, as as some other unique function design.Battery Indicator System Including:Delay Display Function, off Memory Function,Open Circuit Reset Function,etc.Timing System Including: accumulating running hours TOT, hours resettable RESET, etc.Unique Design Including: easy SNAP-IN installation,data stored automatically after diaconnecting with the battery,etc.Colour: blackMaterial: ABSPackage Contents:1 * meter2 * insert 2 * sheath1 * Instruction manualOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.