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 , therefore it can not be replaced. Storage : -55C ; +85C Operation : -40C ; +65C Voltage regulation: 0.5%. color:Black :plastic Package Contents: 1 x Automatic Voltage Regulator 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.