For the Replacement Battery please see Quick find 85520. SB connection:use your PC to access additional power protection & management features for your UPS via a USB (Universal Serial Bus) port Telephone dataline surge protection:provides protection of connected equipment from power surges traveling on telephone lines Automatic Voltage Regulation (AVR):automatically steps up low voltage & steps down high voltage to levels that are suitable for your equipment. Resettable circuit breaker:easy recovery from overloads;no need to replace a fuse Automatic restart of loads after UPS shutdown:automatically starts up the connected equipment upon the return of utility power Automatic self-test:periodic battery self-test ensures early detection of a battery that needs to be replaced