APC Back-UPS BK650EI - 650VA 4x C13 output USB Standby Offline 0.65 kVA 400 W Si
Output connection: (1) IEC 320 C13 (Surge Protection) � (3) IEC 320 C13 (Battery Backup) � (2) IEC Jumpers (Surge Protection). For information on how to communicate with the S20, see APC's Application Note #102.