This digital gauge displays the voltage. With high brightness LED￡? there is no difficulty in seeing the display. <br><br><strong>Features:</strong> <br>This digital gauge displays the voltage. <br>With high brightness LED￡? there is no difficulty in seeing the display. <br>Powered by cigarette lighter charger. <br>Constantly monitor battery voltage￡? extend and protect the battery and engine life. <br><br><strong>Specification:</strong> <br>Color: black <br>Material: ABS <br>Voltage: DC 6-30V <br>Dimension: Approx.2.8 * 1.6cm (Screw Diameter * Height) <br>Package Size: Approx.9.3 * 4.3 * 3cm / 3.6 * 1.7 * 1.2in <br>Package Weight: Approx.13g / 0.45oz <br><br><strong>Package List:</strong> <br>1 * Voltage socket