Easy installation;Sufficient accessories;No additional tools needed;Time saving and effortless;New RL-BI004 Battery Indicator with Hour meter. It can work on most lead acid storage battery.It has a powerful battery indicator system and timing system, as well as some other unique function design.Battery Indicator System Including:Delay Display Function,Power off Memory Function,Open Circuit Reset Function,etc.Timing System Including: accumulating total running hours TOT, total 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 * Power meter2 * insert spring2 * sheath1 * Instruction manualOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.