1. The hardware chip will randomly apply for voltage, for example, you need a 15V model.
It may produce other voltages
2. Hardware chip, can not be upgraded, can not choose voltage
3. Does not support charging head information reading
4. Does not support other gears except for fixing a few voltages, such as PPS gear
5. You forced a 12V tablet computer with 15V, causing the computer to overheat and cause a fire.
6. Does not support PPS gear arbitrary voltage selection
7. Does not guarantee compatibility with most charging heads