1Battery Capacity Tester: The scanner tool could provide a quick reading to determine if a vehicle battery needs a jump or replacing, to ensure safe driving. 2Unique Design: Designed with a three character lighted digital dispaly, the voltage testing has high accuracy, makes it easy to read and analyze. 3Safety Ensured: The digital voltmeter testing range is 420V DC, with reverse hookup and over voltage protection, making the analyzer safe and simple to use. 4Easy Operation: The different color indicates battery and charging system status, the dedicate design allows you to quickly know the status of the car. 5Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability.