Nominal Power : 1500VA / 900W Input Voltage Range : 145 - 280VAC Input Frequency : 50Hz Output Voltage : 220V ± 10% Frequency Range : 50Hz ± 1Hz Transfer Time : < 6ms Wave Form : Square Wave Form Protection : Surge & Overload & Short Circuit Battery Quantity : 2 x (12V / 9AH - [2.05 Kg]) Battery Type : Sealed Lead Acid (SLA) LED Indicator : Yes Automatic Voltage Regulation (AVR) : Built in Sockets : 3 x Universal / 1 x IEC Power Cable : 1m (British) Exterior : Metal Case / Black