Parameters:
Used as a 2-wire voltmeter, working voltage: 4.0~40V (with reverse connection protection)
Used as a 2-wire voltmeter, measuring voltage: 0.0~40V.
3-wire working voltage: 4.0~40V (with reverse connection protection).
3-wire measuring voltage: 0.0~100V.

Measurement accuracy:1 %(+/- 1 digit)
Refresh Rate：about 200mS/times
Operating Temperature:-10 °c ~ +65 °c
Power consumption: 5-15mA in normal condition
Display:Three 0.28 " LED digital display
Display Color:Green/Red/Blue/Yellow
Cutting size:23.5mm x 10mm
Mounting holes distance:28mm

Wiring:
The second and third pictures are the wiring diagrams.
Red: Power Supply +,(4.0~ 40V DC)
Yellow: Measure Voltage +,(0~ 100V DC)
Black: Power Supply -, Measure Voltage -

Note:
1.The meter requires extra power supply of DC 4.0 to 40V
2.Its resolution is 0.1V and its actual error might larger than 0.1V

Package Included:
3pcs NOYITO 0.28" LED Ultra-small DC Digital 0-100V Voltmeter