Feature: 1. SIMPLE WIRING: Equipped with two wires, the wiring is convenient and simple, easy to connect to the car, battery car, motorcycle in car wiring 2. REVERSE CONNECT NOT BURN: With reverse connection protection function, the wire will not be burned when reversely connected, with fine tuning function 3. BEST MEASUREMENT ACCURACY: When measuring voltages below 10V, two digits after the decimal point are displayed; when measuring voltages above 10V, one digit after the decimal point is displayed, which can not only take into account the needs of battery users for measurement accuracy, but also take care of the need to measure higher voltages 4. MEASURE VARIOUS BATTERIES VOLTAGE: Can be used to measure the voltage of 18650 batteries, cell phone lithium batteries, NiMH battery packs and other battery packs, and can also be used for other voltage measurement purposes 5. DC2.4~30V DETECTION VOLTAGE RANGE: Measurement rate ≥200mS/time, measurement accuracy for 3‰, detection voltage range is from DC2.4~30V Specification: Item Type: Mini Digital DC Voltmeter Material: PCB Working Voltage: DC2.4~40V (with reverse connection protection function) Detection Voltage: DC2.4~30V Working Current: <30mA Display Mode: 0.28in LED Measurement Rate: ≥200mS/time Measurement Accuracy: 3‰ Extreme Working Conditions: Low Operating Voltage: +2.4V Maximum Working Voltage: +40V Working Temperature: -10~+65℃ Working Humidity: 10~80% (no condensation) Working Air Pressure: 80~106kPa Sun Exposure: No direct exposure. Package List: 5 x Mini Digital DC Voltmeter Note: 1. The maximum input voltage cannot exceed 40V, otherwise there is a danger of burning.2. When the voltage is lower than 3.0V, the display brightness will be dimmed, but it will not affect the correct measurement.