Measuring range: DC 0.00V-30.0V Power supply range: Red: DC4.50-30.0V, Green: DC 4.70-30.0V, Blue: DC5.00-30.0V Working current: Red Less than 23mA, Green Less than 18mA, Blue Less than 13mA Measurement accuracy:+/-1 %(+/- 1 digit) Refresh Rate:about 300mS/ Operating Temperature:-10 c ~ +65 c Display:Three 0.36 inch LED digital display Display Color:Green/Red/Blue Lead length: 15cm Size:23 x 15 x 10 mm Mounting holes distance:28mm Hole diameter:2.8mm Wiring: Red: Power Supply +,(4.5~ 30V DC) Yellow: Measure Voltage +,(0.00~ 30.0V DC) Black: Power Supply -, Measure Voltage - Note: 1.The meter requires extra power supply of DC 4.5 to 30V 2. resolution is 0.1V and actual error might larger than 0.1V NOTES: When measured voltage is larger than 30V, the voltmeter will be damaged. color:As shown :Metal Package Contents: 2 x 0.36inch voltmeter head 3 wire red 2 x 0.36inch voltmeter head 3 wire green 2 x 0.36inch voltmeter head 3 wires blue Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.