Product description
This dc power supply cable will boot iPhone logic boards by itself, without the need for a battery and/or charge port.  Just plug in one of the ends to your iPhone 6 6P 6S 6SP 7 7P 8 8P X, XS, Xs Max and then push the left button to turn the device on and the right button to boot the logic board.  This is a must for iPhone logic board troubleshooting!!