Universal voltmeter compatible with lead-acid batteries for DC 12/24/36/48/60/72/84V, lithium batteries for DC 3-24 series, and iron-lithium batteries for DC 4-24 series, suitable for daily use. EASY TO USE: Features a built-in switch to turn off power, ensuring zero power consumption when off. Default manual voltage switching with a two-button design for simple and efficient setup, completed within seconds. CLEAR DIGITAL DISPLAY: Equipped with a PVC waterproof screen protector, bright backlight, and low power consumption, allowing clear visibility from multiple angles. SAFE DESIGN: Compact, lightweight construction with water-resistant finish. Includes a 30cm power cord for easy connection. Built-in reverse connection protection prevents damage during incorrect installation. Specifications: Working Voltage: 12-84V Display: Capacity/Voltage Backlight: As shown Material: ABS