Prime PB004125 Elite Series Total Internet 8-Outlet 3750-Joule Surge Protector, Black RJ11 - telephone line protection for your satellite system, dial-up modem, and fax Machine and RJ45-protection for your DSL network. Snug Plug low-profile plug saves space and allows furniture and equipment to be placed closer to the wall. An Audible Alarm sounds when surge protector has sacrificed itself to protect the connected equipment. Coaxial Cable line provides protection for CATV and Cable Modems Auto-Shutdown when surge protector absorbs potentially damaging current, this feature shuts power down at the wall, preventing power from passing through the surge protector to the connected equipment.