iPhone 12 Series -  Mechanic iBoot Power Supply Test Cable
Mechanic iBoot DC Power Supply Test Cable for iPhone 12/12 Mini/12 Pro and 12 Pro Max.
Plug your USB Power Supply directly to the motherboard battery Adapter.
It is used for connecting USB Power supply to the motherboard battery header directly.
Using this USB Power Cable will provide the same function as using an on-board USB port on the motherboard.