About this item 3-Outlet surge protector 900 joules offers superior surge protection for your home office devices. 4 USB ports (4.8 AMP combined) for charging your tablets, smart phones, and other mobile devices. Wall-mountable for 3 extra AC outlets without extra cords. Its compact and lightweight design means that you can slip it into your carry-on bag and take it with you. Dimension: 5.98 x 3.86 x 2.44 inches.