Voltage supply/sensing range 85 to 139 V (50/60 Hz)Rapid response time (500 ) for a transient voltage variation amplitude of 20%Voltage setting P1 - Stability setting P2.Frequency: 50 Hz with ST3 jumper; 60 Hz without ST3 jumper.The size of the screwdriver tip used to adjust the potentiometer is 2.5 mm- Power supply by 8 A fuse, slowblow action (tolerates 10 A for 10 s) The fuse is impregnated in the resin, therefore it can not be replaced.Storage : -55C ; +85COperation : -40C ; +65CVoltage regulation: 0.5%.color:BlackMaterial:plasticPackage Contents:1 x Automatic Voltage RegulatorOnly 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.