Rated supply voltage: AC220V Operation voltage range: AC140V-300V Rated frequency:50/60Hz Hysteresis:Over voltage and asymmetry:5V, Under voltage:3V Asymmetry trip delay: 10s Max load current: 100A Voltage measurement accuracy: 1%(over the whole range) Rated insulation voltage: 450V Output contact: 1NO Electrical life:100000 Mechanical life: 100000 Protection degree: IP20 Pollution degree: 3 Altitude: 2000m Humidity: Less than 50% at 40'C(without condensation) size: 91 x 102 x 52MM Material: PC colour: white Package Contents: 1 x Voltmeter 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.