This surge suppressor is designed to protect valuable electronic devices from damaging power spikes and interference found in all electrical power sources. When this occurs, the surge strip dissipates the incoming and outgoing voltage to a level that will not damage equipment. Has 4 Outlets w/ USB Charger. The USB charger is suiting for Mobile Phone, MP3, MP4, PDA, iPhone, iPod or Digital Camera. Allows larger adapter plugs to be utilized without blocking other outlets. LED power indicator for USB socket charger.