Input voltage 220vac input frequency 50hz input phase single phase input socket with fuse cold start (0 to 100% load) press the on/off switch input range (220v) 140v-300v rating output (va). 650va rating output (w). 390w rating output (w). battery mode(simulated sine wave), ac mode (sine wave) power factor 0.6 rating voltage 220v output range 220vac-7%+15% ( in battary mode ) rear output socket 2xuniversal - battery backup transfer time typical 4-8 ms communication interface nil rating frequency 50hz output frequency line-mode synchronize with the utility battery mode 50 hz±1hz output frequency line mode synchronize with the utility short circuit protection line mode fuse & firmware protection