Wide Working Voltage Range: This battery monitor supports a wide working voltage range (DC 6-63V) and can be adjusted to 12V, 34V, 36V, or 48V according to the battery voltage. Powered by a built-in circuit, no external power source required. PVC Waterproof Screen Protector: Waterproof design with two buttons. The function button allows switching between Capacity, Voltage, and Off. Display options include voltage, battery capacity percentage, or alternating view. The setting button is used for battery selection and other configurations. Clear and Bright LCD Display: Features a high-quality LCD for clear and bright viewing from all angles. Automatically enters sleep mode after 10 seconds to conserve power. Reverse Polarity Protection: Simple connection with reverse polarity protection to prevent damage if connected incorrectly. Compatible Battery Types: Suitable for lithium and lead-acid batteries, including ternary lithium, polymer, lithium-ion, and storage batteries. Not compatible with Lithium Iron Phosphate batteries, 1-2 series Li batteries, or more than 15 Li batteries in series. Color: Black Material: Plastic Size: 24 x 44mm Package Contents: 1 x Battery Meter 1 x Wire Note: Only the items listed above are included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3cm.