Three intelligent USB charging ports (one USB C) AC normal operating voltage range 100-240V. It supports nine electronic devices at once, such as phones, ipads, laptops, lamps, cameras and many others. Smart USB charging port :5V 4.5a shared rated, high-speed USB port automatically detects charging devices to provide optimal charging speed "surge protection" indicator LED lights up to show that your device is protected to the maximum extent from electrical spikes. Plastic studs on the bottom are also used for reinforcement. For USB sockets and GFCI sockets, disconnect the plastic plug before use. In addition, the phone can be easily placed on the top of the phone holder while charging.