Description : This is LED mini 0.56 inch digital voltmeter panel meter DC 0-99.9V 3 wire Module name : voltage display module Measurement accuracy : 0.1% Refresh rate : About 200ms Display : three 0.56 inch digital tube Measuring range : 0V-99.9V Power supply range : DC 4.5V-30V Operating current : less than 8mA Display color : Blue, green Storage Temperature : -10 \u2103 to +65 \u2103 Input impedance : approximately 100K External dimensions : 4.7cm x 2.8cm x 2.6cm \/1.85inch x 1.1inch x 1.0inch Weight : 14g Red line for "+", black line for "-". Yellow line for "test" (0---99.9V) Package included : 1 X Digital voltmeter