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Features : Size: 4cm X 2cm X1.6cm Reverse Connect Protection Range: DC1.7-25V ( Can Measure Power Supply Directly ) Display: 0.4 "LED digital tube Display color: GREEN Refresh rate: about 500mS / times Input: DC voltage Resolution: 1% +1 digit Power Supply: DC1.7-25V Operating temperature: -10 ℃ ~ 65 ℃ Application: Motorcycle, Car, E-bike, ATV, Scooter, and so on red cable DC+, black cable DC -, Attention if the Voltage over 25V ,it maybe will burned. Package 100% Brand New 1 x 1.7V to 25V Voltage LED red Mini Digital Panel Meter