Your Matchstick already allows you to enjoy your music and video on your Kindle Fire in any room of your home. Expand your enjoyment of your Kindle Fire with the rechargeable battery pack for teh GRace Matchstick. Add a Grace Lithium Ion Rechargeable battery pack and you can unplug your Matchstick to move it anywhere inside or outside your home with uninterrupted music and videos. You can listen for up to 6 hours between charges. The Matchstick will automatically charge the battery when plugged into an AC wall outlet, even while playing music and charging your Kindle Fire.