Features: Equipped with 2 connection wires, easy to wire (convenient for testing car, motorcycle and battery basket); No extra power needed; High-precision voltage meter, DC 2.5V-30V measuring range; With reverse wiring protection and precise function adjustment; Specifications: Type: Digital Voltage Meter Measuring Range: 2.4V-30.0V Voltage Measurement Error: 0.05V Operating Current:lt; 30gt; Display Mode: 0.36" LED Refresh Rate: About 100ms/time Line Length: 20cm / 7.87in Display Color: Red Operating Temperature: -10 - 65°C Product Size: 35 x 20 x 20mm / 1.38 x 0.79 x 0.79" Mounting Hole Size: 32 x 21mm / 1.26 x 0.83" Notes: When the voltage is below 3V, the brightness of the display will dim without affecting the correct measurement. Test voltage higher than 30V may damage the product.