The Inflight Power Recharger is a device that claims to recharge any USB-powered device as long as you can access a headphone jack on a plane, train, or bus. This tiny device functions as a ‘charge pump’ that stores low amounts of voltage retrieved from the headphone jack in a capacitor, subsequently converting it into regulated USB power.

The process sounds extremely tedious and you could wait a long time for a full charge, but that is always better than a flat battery. The Inflight Power Recharger also stores two AAA batteries that help charge your devices in the event where there is no headphone jack available. The base unit retails for $34.99 upwards, depending on where you pick one up.