Four retangular digital blue LED voltmeter panel DC 0 - 99V mini meter. High-accuracy meter displays blue digital numbers. Pops into rectangle hole you make in metal or plastic chassis. Simply twist the white and red color wires together to read say 12-24VDC such as a vehicle or battery "go box". See other instructions below...
Brand new and high quality.
Measuring range: DC 0V--99VDC.
Input range: Input: 1V up to DC 99V on the red + black wire and 9V-18V for white wire + black that's to the circuit to run I.C. chip on board.
Working Current:< 13mA.
Display Color: Blue.
Display: Three 0.56 "digital LED.
Measurement accuracy: ±1%.
Refresh rate: about 300mS / times.
Input impedance: > 100K.
Operation Temp: -10℃-+65℃.
Size:2.8cm x 4.7cm x 2.1cm.
White: 9-18VDC power supply source to drive unit chips
Black: Common Ground
Red: can measure volts from 1V up to 99V or twist Red/White together for typical 12-24VDC
Please ask about the above if confusing, happy to help!