540 Joules of surge protection from all types of electrical damage. Built-in fireproof technology handles surges, without starting a fire. Billy Joel would be proud. With a super slim 1.1" profile, you can fit this on-wall surge protector in tight spaces & get a finished look. Works great as a power adapter, with 3 AC outlets & 2 USB ports to rapidly charge your phone. It's got plenty of juice, with enough left over for a delicious smoothie.