1. Can measure voltage, frequency, accumulated running time, and current running time simultaneously.2. 4-digit high brightness LED digital tube displays measured values, can provide clear readings.3. With screen change button, easy to replace and install.4. No external working power required, stable to operate.5. Available in 220V AC system.Item Type: Generator Digital Display MeterParameter Display:Phase Voltage: VFrequency: HzCumulative Running Time: HCurrent Running Time: RRange and Accuracy:Voltage: AC165-275V (220VAC System), Level 1Frequency: 40-70Hz, 0.5 LevelCumulative Running Time: 0-9999H, Level 2.5Working Power: AC165-275V (220VAC System) Power Consumption: Maximum 1WOperating Temperature Range: -20~75(WxHxD): . 58x54x41mm / 2.3x2.1x1.6inMounting Opening(): . 47x37mm / 1.9x1.5inColour:blackMaterial:ABSPackage Contents:1 x GV13T-220V Digital Display Meter VoltmeterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.