4-in-1 Universal Wireless Charging Station - 15W, 9V/2A, 9V/3A Q20 This incredible wireless charging station Q20 can charge even four devices simultaneously! Thanks to its foldable design, you can take it as your traveling partner when on a trip, and to charge two phones, earphones, and smartwatches together, you need to use a 9V/3A charging adapter (NOT included).