Product Details Product Group: LONG TIME BACK-UP UPS Model Features UPS - 500LTX / 800LTX Built In AVR Short Circuit Protection Optional Software Interface Compatible With Any Battery UPS - 1000 LTX Built In AVR Short Circuit Protection Optional Software Interface Compatible With Any Battery UPS - 2200 LT X / 3000 LTX Built In AVR Wide Input Range Battery Deep Discharge Protection Built In EMI / RFI Suppression