Key Features Charges up to Three USB Mobile Devices 1 x 3A USB Type-C Port 1 x USB Type-A Quick Charge 3.0 Port 1 x 2.4A USB Type-A Port 2.4 A, 2A, and 3A Power Output Supports Data Transfer while Charging Power Indicators Rechargeable Lithium-Ion Battery The 20,100mAh Turbo Portable Battery Pack features three USB ports for charging: one iSmart 3.0 USB Type-A port, one USB Type-A port with Qualcomm Quick Charge 3.0 technology, and a USB Type-C port. With Quick Charge 3.0, you'll be able to charge your compatible devices faster and spend less time waiting around. Its USB Type-C output is powerful enough to charge a MacBook while simultaneously transferring data to your mobile phone via the iSmart 3.0 USB port, which offers smart voltage and current distribution, and data transfer for extra functionality. The Turbo battery pack also has built-in overcharge, high-temperature, and short-circuit protection.