The AirSep FreeStyle desktop battery charger is an external device that plugs into any of your home's conventional wall outlets with the included AC power supply. Featuring two charging bays means that you can efficiently charge up to two FreeStyle battery packs simultaneously. This benefits you because you will now have the ability to place up to two battery packs in the desktop charger and carry-on with the rest of your day. Once you return home or from enjoying the tourist destinations, you will have 1 or 2 fully charged batteries that you can exchange for the current, depleted battery pack. The desktop charger is an ideal accessory for both patients who frequently travel and for those who have multiple battery packs. You no longer have to put your life on hold for extended periods just to wait for a charging cycle to complete, as the AirSep FreeStyle desktop battery charger requires up to 4-5 hours to complete a charging cycle for a fully depleted battery pack. This allows you to constantly have a battery charging for future use with minimal downtime.