Yubi Power 40 Port Universal USB Family Charging Tower Station w/ Surge & Overload Protection for Iphone, Ipad, Android Devices, Samsung, Digital Cameras, Mp3 Players, or Any Usb-charged Device. 40 Universal USB ports (33.6A total) auto-adjust charging rate for all of your tablets, smart phones, & digital cameras. Supports: simultaneously charge 40 different USB 1A devices or 16 different USB 2A devices. All USB ports are grounded & provide superior protection from power surges, spikes, and damaging voltage fluctuations. Premium quality circuitry & professional quality fire-retardant material ensure life-time safety and reliability. AC 110-250V voltage with each tower block featuring its own individual ON/OFF switch.