To take full advantage of the Xiaomi 120W Charging Combo (Type-A) for fast charging, it is essential to use the included original cable. When you connect your device using the original cable, the charger can deliver its maximum output, ensuring a swift and efficient charging experience. However, if you opt for a regular or counterfeit cable, you will not be able to access the fast charging capabilities, which can result in slower charging speeds. To ensure optimal performance and safety, always use the original cable provided with the charger. This will not only enhance charging efficiency but also help protect your device from potential damage.