The 20 W wireless charger adopts a new design, which is 100% higher than the peak charging power of the previous generation. The maximum energy can reach 20 W. It can be charged in 90 minutes by charging the Xiaomi 9 more than the wired charging of many mobile phones. A new cooling hole is added to the bottom of the charging board, and a separate silent fan and heat sink is built in. The dual cooling system can effectively reduce the temperature rise during the wireless charging process and improve the charging efficiency.