WHAT IS IT? - The QianLi Macaron Spot Welding Machine is needed to spot weld a new replacement flex on a replacement battery for iPhone 11/ 12. This enables you to use tools like QianLi Copy Power and transfer the flex with data to a new battery cell.FUNCTIONS - It is used for cell phone battery flex transfer, needed to spot weld flex to new battery cell.COMPATIBILITY PACKAGE CONTENTS- The QianLi Macron Spot Welding Machine comes complete with 3 holding fixtures which allow you to work with the flex cables on batteries for iPhone 11 and 12 series only.MULTI FUNCTION - Can also be used with other types of batteries.PORTABLE - Built in rechargeable battery makes this a totally portable unit.