EFM Power On-The-Go Twin Pack - For all USB-C Devices - BlackEFM Power On The Go 5,000mAh Power Bank Twin Pack Black EFM Power On The Go Power Bank is your ultra convenient pocket friendly portable power solution. Small enough to fit into the palm of your hand, the 5,000mAh capacity outputs up to 20W of power to your device. This means it can fast charge your iPhonnne 15 from 0 50% in only 30mins. An integrated male USB C port works both as an input and output, so you won't even need a cable to either charge