Features: *1. Battery Testing Assistant: compact and portable, high sensitivity, fast reaction speed, simple and convenient operation. *2. Basic Battery Parameters: such as voltage, internal resistance, cold start amplifier and AH capacity, battery health, and charging state. *3. Always Ready To Use: Clamp the alligator clips and start battery testing. Built-in anti-reverse protection helps you connect two clips correctly. *4. LED Display Screen: with backlit, enabling you to clearly see the measured values in the dark, making it easy to read. *5. Widely Used: Suitable for automobile and electric vehicle maintenance, as well as household and enterprise vehicle maintenance and repair. Description: *1. Model: BT-171 *2. Material: ABS *3. Test Method: positive and negative alligator clips *4. Test Voltage: 12V *5. LED Indicator Light: red/yellow/green/blue/white/colored light Package Includes: 1 x Battery Tester 1 x Instructions