The MFI 1M means each cable contains a unique, verified serial number and an authorisation chip issued by Apple which communicates with any Lightning connector device to ensure 100% compatibility in future.
The cable is compatible with the below:
iPhone 6/6 plus/5/5c/5s/SE/6s/6s plus
iPad pro/air/mini/ipad (4th gen)
iPod touch (5th gen)/nano (7th gen)