Anker Charger (140W, 4-Port, PD 3.1) with USB-C CableFast Charging for Four Devices: Enjoy the convenience of powering four devices simultaneously with our advanced GaN technology for optimal performance. Dual High Speed USB C Ports: Rapidly charge your 15 inch MacBook Air to 50% in just 30 minutes with either of the two USB C ports, each offering a maximum output of 140W. Superior Safety: The advanced ActiveShield 2. 0 system monitors device temperatures over 3 million times a day for enhanced safety.