The so-called two-way refers to the input direction and output direction of the mobile power supply itself. The input direction to the mobile power fast charge can shorten the mobile power full charge time; The output direction is the charging bank to charge the mobile phone can also be charged fast. The so-called fast charge is actually a large charge and discharge power, the original is basically 5V1A, that is, 5W, and then 5V2A=10W,9V2A=18W, and the latest Huawei has launched Supercharge technology 4.5V5A=22.5W. The higher the power, the faster the charge, the shorter the full charge time. Of course, the premise is that the power adapter for charging the mobile power supply and the required charging mobile phone have the corresponding chip fast charging can have an effect.