About this item 2 NEMA 5-15R SURGE PROTECTED OUTLETS: Provide 500 joules of protection for computers, electronics, and home theater equipment. 3 USB CHARGING PORTS: Share 4.2 amps to help charge and power tablets, smartphones, MP3 players, and other mobile devices. CONTEMPORARY DESIGN: Helps it blend in naturally in the modern home, while providing power protection to connected devices. SAFE-FAIL PROTECTION: Power to connected equipment is cut when the surge protector cannot provide protection. Product dimensions: 3.2 x 2.9 x 2.4 inches.