Your Mondo or Mondo+ already allows you to enjoy your music wirelessly in any room of your home. Expand your enjoyment of your Grace Digital Mondo + or Mondo Elite Wi-Fi radios with the rechargeable battery pack. Add a Grace Lithium Ion Rechargeable battery pack and you can unplug your radio to move it anywhere inside or outside your home with uninterrupted music. You can listen for up to 13 hours between charges. The radio will automatically charge the battery when plugged into an AC wall outlet, even while playing music.