The combined USB-A charger with Qi certified wireless charger makes it multi-functional. The Qi charger pad on top, ensures optimal charging for all Qi enabled devices and even charges through cases up to 3mm thick. A simple touch of a finger tip, releases the spring-loaded tower with 3 USB-A charging ports, for devices that do not support wireless charging. The pop-up tower can be lowered when not in use to keep reading table clean. USB-A charging cord not included. The 'Qi' symbol is a trademark of the Wireless Power Consortium.