The Tripp Lite® by Eaton® TLP864USBB Protect It! 8-Outlet Surge Protector with 4 USB Ports and 6-Ft. Cord is the ideal surge protector for your home or office workstation. It features a surge protection rating of 1,800 Joules to defend your sensitive electronic components against power surges and spikes. This surge protector with 4 USB ports is ideal for keeping your devices at full capacity. They share 4.2 amps for charging your smartphone, tablet, and other USB mobile devices, which are also protected from the damaging effects of surges, spikes, and line interference. Various electromagnetic and radio sources found in virtually every home and business can cause disruptive interference on the AC line. Known as EMI (electromagnetic interference) and RFI (radio frequency interference), this line noise is a common cause of performance problems. This surge protector filters out disruptive line noise that can disturb your electronics and inflict hardware damage or data loss. This EMI/RFI filtering also helps your connected components perform better with longer lifespans. Automatic shutoff permanently cuts power to outlets if protection circuit is incapacitated, preventing equipment damage, and indicating replacement is required. A green LED confirms your connected equipment is protected. This surge protector with 6 ft. cord and NEMA 5-15P plug allows you flexibility in placing the unit away from a wall outlet.