The Best Buy essentials 5,000mAh Magnetic Wireless Portable Charger for iPhone and Most USB-C Devices provides 7.5W of total power to keep your devices charged and at the ready, while a USB-C port can provide up to 15W to charge an additional device. With a 5,000mAh capacity ...The Best Buy essentials 5,000mAh Magnetic Wireless Portable Charger for iPhone and Most USB-C Devices provides 7.5W of total power to keep your devices charged and at the ready, while a USB-C port can provide up to 15W to charge an additional device. With a 5,000mAh capacity, attach the charger to your iPhone or use the included USB-C cable for wired charging.