LED display indicates condition, for 12V battery only.Alternator state check, battery state check, check before charge and overload display.Alternator check: accelerate your engine to 2000 rpm when the green light is lit ,charging circuit is ok.Battery check: indicate the percentage charging in the battery .Charger check: when green light is lit, charging is complete.LED display indicates conditionCheck before Charge: Battery is alive, "OK" to be charged. and high qualityMultiple functions: alternator state check, battery state check, check before charge and overload display.6-LED display, clearly present the alternator and battery state.Two testing clips for safe and easy operation.Small size and light weight, convenient to carry.Fit car, motorcycle, etc., with 12V battery.Specification:LED quantity: 6 (2 red, 3 green and 1 yellow)Material of wire: 0.06square millimeter copperMax. voltage and current: 12V 15ALength of wire: 25cm / 9.84incolour: blackMaterial: ABSsize: Battery tester size: 12 x 5.2 x 1.8cm / 4.7 x 2 x 0.7inchPackage Contents:5 x Battery Tester with Two ClipsOnly the above package content, other products are not included.Note: Light reflection 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.