The M18 Power Source is an adapter that snaps on to any M18 battery (sold separately) and converts it into a powered USB port to charge cell phones, MP3 players, digital cameras, and other portable electronic devices. This adapter is also compatible with Milwaukee's line of M12 Heated Jackets.

NOTE: The product photo is an illustration showing the adapter (red) attached to a Milwaukee M18 battery as an example of how it works. The M18 battery is not included with this adapter.