Cable Matters 3-Outlet Wall Mount Surge Protector with 2.1A Dual USB Charging Wall mount surge protector converts any standard single gang wall outlet into a mini USB charging station for powering, protecting, and re-charging your smartphones or tablets Surge suppressor with shared 2.1 amp USB ports charges two mobile devices simultaneously; Dedicated USB charging ports eliminate the need for proprietary wall adapters and re-charge faster than a computer USB port Simple and secure installation into any vertical grounded AC outlet with the integrated stabilizing post and included outlet mounting screw Reliable power surge protection combines a 540 joules suppression rating, low clamping voltage, advanced X3 MOV safety shutdown technology, and EMI/RFI noise reduction to protect up to five connected devices 3 outlet tap with a diagnostic green Protected LED verifies surge protection status at a glance