Universal voltmeter compatible with lead-acid batteries (12/24/36/48/60/72/84V DC), lithium batteries (3-24 series), and iron-lithium batteries (4-24 series), suitable for daily use. EASY TO USE: Built-in switch allows power to be turned off completely, eliminating power consumption when not in use. Default manual voltage switching with a two-button design for quick and efficient setup, completed in seconds. CLEAR DIGITAL DISPLAY: Fuel gauge indicator features a PVC waterproof screen protector, bright backlight, and low power consumption, enabling clear visibility from multiple angles. SAFE DESIGN: Compact, lightweight construction with water-resistant finish. Includes a 30cm (11.8in) power cord for convenient connection. Reverse polarity protection prevents damage from incorrect connections. Specifications: Working voltage: 12-84V Display: Capacity/Voltage Backlight: As shown Material: ABS