Convenient 6 ac + 4 usb ports, safemore vps(vertical power stacker) origin 3l+ provides plenty of power to charge up to 14 devices simultaneously (max 2500w). 2 metres long heavy-duty power cord and 2 on/off switches offer more safety and convenience. Built-in mechanism for smart distribution of current between devices. 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.