The UX lets you quietly run almost any AC equipment from your batteries--hand tools, microwaves, TVs, computers, even energy-hungry small refrigerators. The UX will start loads that surge up to triple the continuous rating, and run a load of twice rated current for nearly a minute. It also makes the most of battery power with efficiencies of up to 92%. Under no-load conditions it consumes a miserly 1/2W. Plug into utility power or start a generator and the UX instantly transfers power to your electrical system as it rapidly charges your batteries. The UX never overcharges or overheats batteries and maintains a full charge indefinitely as it ensures longer life in both sealed and liquid lead acid batteries. If your AC power fails, the SB model switches over within 16 milliseconds to keep lights, phones, appliances and most computers on line. A crystal-controlled voltage and frequency circuit protects appliances, as well. In the inverter mode, UX "smart" protection circuitry delivers all the energy your batteries can safely provide, then automatically shuts down to prevent over-discharge. Remote Control (RC-8/50 or RC-8/100) mounts up to 100 feet away. SB model option provides automatic battery charging and AC transfer switch. Battery Temperature Sensor (BTS) automatically controls accurate charge to batteries. 500VA 12 VDC 230 VAC 50Hz