Features: Alternator status check. Battery status check. Battery overload display. 6-LED display, clearly showing alternator and battery status. Two test clips for safe and convenient operation. Small size, light weight and easy to carry.Suitable for cars, motorcycles, etc. Heavy Duty Insulation Clips for 12V Lead Acid, Hard Top, Discharged and Maintenance Free Batteries. Simple and safe to use, no sparks. There are good chips inside, and the surface is not easy to heat up.Mini 12V Car Battery Tester Digital Alternator Car Tester 6 Light Display Car Diagnostic Tool Car Current Tester 6 LED Lights: Alternator Status Check: First Light (Red): Fault Second Light ( Green): Good Third Light (Green): Complete Battery Status Check: First Light (Yellow): Medium Second Light (Red): Low Third Light (Green)