USB 3.1 Type C USB-C 12-1 to Surface Pro3 Pro4 Pro5 Pro6 Book Cable 1.8m Build-in the at Type-C male end. input: Type-C male, 65W or 87W Type-C and sUpport 12/1 output. output: Microsoft Surface Laptop male, 12v-1 Use it with 65W or 87W Type-C and sUpport 12/1 output to conveniently your Laptop with 12v-1 port. Please note the Type-C must sUpport 12/1 output. Otherwise it doesn't work.