The Xiaomi 120W charger uses Xiaomi's self-developed fast charge technology, which is not compatible with Huawei's fast charge technology, so it cannot directly charge Huawei's mobile phone. Although its output voltage and current can match Huawei's phone charging needs, this does not mean that it can work properly. Therefore, if you want to use a Xiaomi 120W charger to charge a Huawei phone, you need to use an adapter or charging cable for conversion to ensure compatibility and security.
Xiaomi's 120W fast charge technology and Huawei's fast charge technology are not compatible. Fast charging technology is mainly developed and promoted by mobile phone manufacturers, and the fast charging technology used by different manufacturers may be different. Therefore, Xiaomi's 120W fast charge can only be used on Xiaomi mobile phones, and it cannot fast charge Huawei mobile phones.