Simple adjustment: the red wire is positive and the black wire is negative. The white plug with electronic protection goes to the socket of the tester module. Applicable battery: suitable for 12V lead-acid battery, ternary lithium battery, polymer-ion battery, storage battery, water battery, etc All batteries are universally adjustable. Clear LCD Display: The battery monitor is designed with high quality LCD display, provides clear and bright display from any angle. Automatically enter sleep mode in 10 seconds to save power.Multi-functional meter: The battery indicator can display battery capacity and voltage, Celsius / Fahrenheit temperature at the same time. Small size, light weight, convenient to carry.Protection: The waterproof shell with a button can prevent dust and water stains. It is as smooth as a mirror, the buttons are soft, and the operation is simple and comfortable. Product Specifications: - Material: ABS - Product size: 61.5 x 33.5 x 13.5cm - Installation size: 58.5 x 28.5 cm - Screen size: 3.3 x 16.5cm - Operating voltage: 10V-100V - Sleep power: 10UA - Operating temperature: -10~65- Screen Display: LCD - Reverse Protection: Yes - Weight: 21g/Pc Package includes: 2 x Battery Capacity Monitor Features: 1. With a buckle, easy to install without screws. LCD display, super bright blue backlight, convenient to check. 2. Simple connection with reverse protection, will not burn if the connection is reversed. 3. Widely used for cars, motorcycles, scooters, bicycles, power bank, test equipment, etc. Notice: Default setting is suitable for use in 12V lead-acid batteries .