Panel mounting voltmeter 3 wire 

Red wire illumination any voltage between 5-30v 

White wire voltage to be measured 4.5-30v

Black wire common neg 

Display: 3 Digits LED

Measuring voltage range 4.5V-30.0V

Precision: 1%

Operating Current: less than 20mA

Input impedance> 100K ohms

Refresh speed of about 300mS 

Display Color: Red 

Operating temperature -10 ℃ ~ 65 ℃

Size: Approx. 48x29x22mm/1.81x1.14x0.87"

Dimensions: 48 x 29 x 22 mm(LxWxH)

Mounting hole: 46 x 27 mm

Net weight: 18g