Product Review

When you upgrade to buy a new phone or laptop, you may find that both of your laptop and smartphone are equipped with USB type C port for charging. So you need the USB C charging cable instead of the traditional one.
 This product is packaged with two USB C-C charging cord. You can use the 6.6 feet one to reach the socket on the wall easily from your MacBook Pro, and then use the 4 feet one to charge your phone from the MacBook Pro. 

Compatible Devices for fast charging
iPad Pro 2018, MacBook Air 2018
MacBook Pro 13.3'' (2016, 2017, 2018)
MacBook Retina 2015, 2016, 2017,2018
Galaxy Note 8, S8, S8 Plus, S9, S10
Google Pixel 3, 2, XL
Nexus 6P, Huawei Matebook
And more devices that compatible with PD/QC charging standard. 

Spec
Length: 4ft (1.2m), 6.6ft ( 2m).
Color: Grey.
Material: Aluminum alloy connectors shell, nylon braid cable body
Charing standard: Power Delivery fast charge, allows max 3A current through.
USB standard: USB Type C to USB Type C, up to 480Mbps data syncing speed.
USB-IF Compliance Test Report for USB Type-C Connector: B18Z62272-USB01

Package includes
4ft USB C-C cable x 1
6.6ft USB C-C cable x 1

Note
The package does not contain a power adapter.
This USB type c to USB type c cable is designed for charging but not available for video streaming
MacBook Pro 15.4'' can not reach the full charging speed via this 3A cable, please choose the 5A USB C-C cable.