Design IdeasThis USB-C to Magnetic T Tip Converter is designed for converting new Book air/pro USB C charger to charge your old version Book with interface, so it could preserve the value of your investment in chargers and make your life more convenience. PD Device RequirementThis USB-C adapter is just a conversion device, you need to provide correct PD power output device and correct USB C-C cable. The Power adapter output should support not less than 16.5V/3.65A.For book USB C chargers, PD 61W/87W can support. It can work with PD Power banks,but the output should support not less than 16.5V/3.65A.If the PD Power Adaptor/Bank is below 60W,It will display 'connect+Disconnect'.The computer will not work below 14.5V. CompatibilityFit the Book Air/Pro After Late 2012.If you choose 60W/61W/65W PD Power with correct C to C cable(above 3.65A), it can charge for book Pro 13 inch.If you choose 87/100W PD Power with correct C to C cable,it can charge for book Pro 15-inch and 13-inch,S