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Welcome to sellbesteveryday.th! Specification: 100% Brand new and high quality Measuring range: DC 0V--30V Optional Display Color: Blue/Green/Red Display: three 0.56 "digital tube Measurement accuracy: ±1% Refresh rate: about 300mS / times Input impedance: > 100KΩ Operation Temp: -10℃-+65℃ Size: approx. 4.7 x 2.8 x 2.2cm (1.85''*1.10''*0.87'') Cable length: approx. 20cm 3 colors have different working current & Input range Input range: DC4.50-30.0V( red)/DC4.70-30.0V(green)/DC5.00-30.0V(blue) (Max Input: DC 30V. The device can be damaged if input is over 30V) Working Current: red< 23mA,green< 18mA,blue< 13mA Wiring: Red: power supply +. Black: power supply -, measure -. White: measure +. Package included:1 x digital voltmeter Note: Please allow 1-5mm errors due to manual measurement Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. HAVE A GOOD SHOPPING TIME!