Features: The "MEDIUM" LED light is-on, the battery voltage is slightly lower, and charging is required. Car batteries Detector-, Suitable for 12V batteries, Overvoltage protection function, LED light display. Has LED reverse screen, the test displays a reverse screen, so that the measured value can be seen- clearly at night or in the dark, which assists the measurement work and makes it easy to read. Designed to test the 12v battery voltage or the voltage of the charging system, with LED display and LED battery status- indicator, rubber body with fish clamp for connection, with reverse connection alarm and overvoltage protection functions. Positive and negative crocodile-clips, with reverse connection alarm and overvoltage protection function, red clip connected- to positive pole- "+" black clip connected- to negative pole-. If the positive and negative fish clips- are connected- backwards, the LED display does not display, and the REVERSE indicator lights up and issues- an alarm prompt. Specifications: Material: Plastic, Copper- Plating Size: Approx. 20x7cm/7.87x2.75in Cable Length: Approx. 31cm/12.20in Package Includes: 1x Battery Tester 1x Instruction Manual note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.