Phone Holder with 3 Outlet Power Surge Protector Wall Tap w/ 2 USB Ports Phone Holder with 3 Outlet Power Surge Protector Wall Tap w/ 2 USB Ports. Includes 2 retractable holders for smartphone and MP3 player. 3 AC outlets with 540 joules of surge protection and 2 USB charging ports for simultaneous charging. Wall-mount to North American standard AC power socket. Each phone slot measures 3 inches, to fit smartphones.