Charge your USB devices and keep your plugs free with this Monoprice 9195 wall plug surge protector. This wall plug plugs into a standard wall power plug (it will occupy both wall plugs) and will provide three power plugs and two USB charge ports. This makes the item perfect for charging your USB smartphones and other items. 3 Outlet Power Surge Protector Wall Tap w 2 USB Ports 540 Joules. 3 Outlet Power Surge Protector Wall Tap w/ 2 USB Ports - 540 Joules.