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 Screen: The battery monitor is designed with high quality LCD screen, provides clear and bright display from all angles. Automatically switch to sleep mode in 10 seconds to save power. Multifunctional meter: The battery indicator can display battery capacity and voltage, as well as Celsius/temperature Fahrenheit at the same time. Small size, light weight, convenient to carry. Protection: The waterproof shell with one button can avoid 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 < p>- Product size: 61.5 x 33.5 x 13.5cm - Installation size: 58.5 x 28.5 cm - Installation size: 39;screen: 3.3 x 16.5cm - Operating voltage: 10V-100V - Sleep power: 10UA - Operating temperature: -10~65 - Screen display: LCD - Reverse protection: Yes Package includes: < p>2 x Battery Capacity Monitor Features: 1. With a buckle, easy to install without screws. LCD screen, super bright blue backlight, convenient to check. 2. Simple connection with reverse protection, does not burn if the connection is reversed. 3. Widely used for cars, motorcycles, scooters, bicycles, power bank, test equipment, etc. Note: The default setting is suitable for use in 12 V lead acid batteries.