The Xiaomi Mi 37W Dual Port Car Charger features 2 USB ports with a total output of 37W, while the USB2 ports max output is 27W, it still provides 27W of fast charging for Mi 9. The car charger utilizes a high-quality main control chip, apart from charging efficiency improvement, it also provides multiple protection features, including overcurrent protection, overvoltage protection, short-circuit protection, temperature protection and electromagnetic interference protection. Its univer