【Free adapter】:FREE 15V 2.58A Usb C port power adapter which is designed for this surface charger cable.( Can also use power bank or USB C wall charger.) 【Output】: USB C surface cable with 15V 2.58A Output. No data transfer function. ( Charging only.) 【Voltage&Amp. Readable】: With a display screen connected with the cable, you are able to read and monitor the voltage&Amp. when you are charging your device.