10-Port USB charger powers up to 10 mobile devices simultaneously without the need to connect to a computer. Up to 5V, 2.1A of power is provided to each port to charge even the most power hungry devices, such as the Apple iPad. Overheating and overcurrent technology ensure safe use with all of your devices. Overcharging feature stops charging your device when its battery is full to prevent affecting the life of your battery. Rubber feet protect delicate desktops and prevent sliding on smooth surfaces.