One for all Elegant round shape design Provides more room between each USB port so you can easily plug in your devices to charge. Charge 65% Faster, Save Up to 40% Charging Time TP-LINK Smart Charging technology that identifies the connected devices and delivers the possible max output, together with 5V/2.4A ultra fast charging speed, UP525 and UP540 can charge 65% faster and save up to 40% charging time. Fully charging iPhone 6s Plus takes 2.4 hours with TP-LINK Smart Charging, while 4.2 hours with an original Apple charger. * Optimization for all devices The compatibility is as high as original charger, which is also compatible with smart devices running iOS, Android, Windows and most other USB-charged devices, from devices with large battery like tablets, to gadgets with tiny battery like smart wearable devices. 5 Flexible Output Ports Powered by TP-LINK Smart Charging technology, all outputs ports of UP525 and UP540 can intelligently adjust the charging power subject to the connected devices. These flexible output ports are designed to be capable of delivering full speed charging power for devices with large battery like tablets, and also capable of delivering and minimal charging power for gadgets with tiny battery like smart wearable devices. Comprehensive Protection UP540 and UP525 adopted the latest safety features provide large double air cooled fin and high quality IC to protect your devices against over-voltage, over current, over-heating, short circuit, power overload, electro static discharge and power surge.