Features Low battery flash alarm reminder function, LED color display, high-end atmosphere. This watch is suitable for: battery car, electric car, battery pack, balance car, inverter, electric forklift, sightseeing car, electric car, car battery battery, battery powered mobile equipment, etc. This meter can test and display real-time voltage, power, and power percentage. It has reverse connection protection function, and reverse connection will not burn. Display mode is optional: single display voltage; single display battery percentage; cycle display of voltage and battery percentage (default). This watch can press the button to set the battery type: lead-acid battery, lithium battery, nickel-metal hydride battery, and also can press the button to set the battery number. Features: -Low battery flash alarm reminder function, LED color display, high-end atmosphere. -This watch is suitable for: battery car, electric car, battery pack, balance car, inverter, electric forklift, sightseeing car, electric car, car battery battery, battery powered mobile equipment, etc. -This meter can test and display real-time voltage, power, and power percentage. It has reverse connection protection function, and reverse connection will not burn. -Display mode is optional: single display voltage; single display battery percentage; cycle display of voltage and battery percentage (default). -This watch can press the button to set the battery type: lead-acid battery, lithium battery, nickel-metal hydride battery, and also can press the button to set the battery number. Specification: Power resolution:1% Working current: <20mA display mode: LED color screen Installation hole: 47.2 * 27.3 mm Measurement rate: ≥ 500ms/ times Voltage measurement accuracy:1% (± 2)  Lead length:> 150mm Minimum supply voltage: 6V Maximum supply voltage: 120V Operating temperature:-10 ~ + 65 Working humidity:10 ~ 80% (without condensation) Working pressure:80 ~ 106 kPa Sunlight exposure: no direct exposure Package List: 1*Voltage Battery Indicator Package List