Quick overview from the supplier:
APC Easy-UPS Rack Mounting 4U SRV1KRILRK (SRVPM1KRIL+SRV36RLBP-9A+ SRVRK1 x2), 1000VA/800W, Double-conversion On-line UPS with Extended Runtime Battery Pack, 4 x IEC Sockets ( 4 IEC C13, all 4 Battery Backup + Surge Protected), Multifunction LCD Display, DB-9 RS-232, USB, with Rail Kit
