Battery tester is designed to quickly test 12 volt batteries - LED display - Indicates battery status - Requires no power source. Can be used directly. Multi-function battery tester: alternator status check - Battery status check - Charge and overload indicator. 6 LED lights divided into 3 groups - First group: DC generators for testing vehicles. Second group: detection of the battery charge level. Third Group: The third group detects battery cranking ability. Smart chip design to distinguish battery power and voltage with multiple LED bulbs. Easy to use - Small size - Lightweight product - Convenient to carry - Ideal tool for every vehicle.