Rated supply voltage: AC220VOperation voltage range: AC140V-300VRated frequency:50/60HzHysteresis:Over voltage and asymmetry:5V, Under voltage:3VAsymmetry trip delay: 10sDescription:Max load current: 100AVoltage measurement accuracy: 1%(over the whole range)Rated insulation voltage: 450VOutput contact: 1NOElectrical life:100000Mechanical life: 100000Protection degree: IP20Pollution degree: 3Altitude: 2000mHumidity: Less than 50% at 40'C(without condensation)size: 91 x 102 x 52MMMaterial: PCcolour: whitePackage Contents:1 x 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.