It's designed to carry enough power to charge multiple devices simultaneously.

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Get this tiny power bank for iPhone and Apple Watch while it costs just $20. Photo: Cult of Mac Deals The remarkably tiny Charge Fob keychain power bank can charge your iPhone and Apple Watch ...

The name for inCharge XS must stand for “extra small.” It packs multiple USB formats plus a Lightning connector into a cable tiny enough to fit on a keychain. But it can handle up to 240W of power.