Liebert PSP has a compact design ideal for desktop applications User friendly LED display to make interaction with UPS easier User replaceable batteries to maximize initial investment Battery-backed sockets and a surge only socket Shutdown software and USB cable included Protects datalines Fully RoHS Compliant 3 years standard wararnty Liebert PSP 650VA is a full featured UPS that delivers cost-effective power protection in a compact package. The UPS provides battery-backed outlets and a surge protection only outlet. The UPS battery offers four minutes of backup power at full load - ample time to shut down protected equipment if an outage occurs. Features Audible alarm(s) Yes Surge protection Yes Output power factor 0.6 Power factor 0.6 Number of output phases 1 Number of input phases 1 Response time 6 ms Output frequency 50/60 Hz Input frequency 50/60 Hz Input operation voltage (max) 287 V Input operation voltage (min) 160 V Waveform Stepwise Output power 39