Overview The SK30USB surge suppressor offers reliable surge and line noise protection. The compact direct plug-in design allows for easy portability and features 3 outlets and 540 joules of surge energy absorption. Diagnostic LED alerts you to potential wiring or protection faults before connected equipment is damaged. 2.1 amp USB charging ports offer fast charging for smartphones, tablets, MP3 players and other portable devices. $5,000 Ultimate Lifetime Insurance (U.S., Canada, and Puerto Rico only).