8 ac + 4 usb ports, safemore vertical power stacker provides plenty of power to charge up to 12 devices simultaneously (max 2500w). 2 metres long heavy-duty power cord and 3 on/off switches (one for usb ports) offer more safety and convenience. Stylish, compact, patent vertical design to save space. Ultimate safety consideration - built-in top class surge protection, and overload protector, fire retardant frame. 4 universal usb ports with auto-adjust charging rate for iphone, ipad, ipod, android devices, digital cameras and more.