Working voltage : 3.3 ~ 30V ( with reverse polarity protection )
Test voltage : 0 ~ 99.9V
Operating Current : <20mA
Display : 0.36 "LED, red  
Dimensions: Length Width 23x 15x 10mm thick
Hole size : 24x15mm
Hole screw hole size : 2mm
Measurement rate :  ≥500mS / times
Accuracy : 1% (1 word )
Extreme working conditions :
Minimum operating voltage : +3.3 V
Maximum working voltage : +30 V

DC0-100V Three-wire Two -line 3.3-30V Digital Voltmeter Red LED
Description:
The voltmeter compact , range DC DC0-100V, require additional auxiliary power
Auxiliary supply voltage range wide, up to 3.3-30V, no regulator
With reverse polarity protection, reverse power lines will not burn
With three wiring, easy access to car / battery car / motorcycle test line
Red line : Header supply - positive , can not exceed 30V
Black line : common ground , meter supply - negative test terminal - negative
Yellow line : Header Test ended input
The voltmeter can be used for various voltage applications

Technical parameters:
Working voltage : 3.3 ~ 30V ( with reverse polarity protection )
Test voltage : 0 ~ 99.9V
Operating Current : <20mA
Display : 0.36 "LED, red  
Dimensions: Length Width 23x 15x 10mm thick
Hole size : 24x15mm
Hole screw hole size : 2mm
Measurement rate :  ≥500mS / times
Accuracy : 1% (1 word )
Extreme working conditions :
Minimum operating voltage : +3.3 V
Maximum working voltage : +30 V
Working temperature : -10 ~ +65 degree
Operating Humidity : 10 ~ 80% ( non-condensing )
Working pressure : 80 ~ 106kPa
Sunlight : No direct exposure It  can be used as two wired, just need red and yellow lines connected together