YOUR : It can cut off the power supply instantaneously when the has overvoltage or undervoltage overcurrent faulty.so as to the electrical equipment from beingdamagedREAL TIME CLEAR DISPLAY WORKING VOLTAGE: You can manully cabibrate the voltage if not .Fine workmanship: exquisite workmanship, safe and , both beautiful, clear outline and safe to use.Different batches, product appearance, color and words may be different, which does not affect the use.Voltage: AC220Vsize: 85 x 36mmMaterial: plasticcolour: WhitePackage Contents:1 x Protector(63A)Only the above package content, other 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.