I was able to use and measure this cable a little. Output power 28W. Very good. I've also seen a standard USB-C charging port that supports 5 volts 3 amps and runs about 4.6 volts 3 amps with this cable. I am very happy. I tested higher voltage. Shipped with: USB C car charger, Anker 49.5W PowerDrive Speed + 2 car adapters. Which is also very nice.