A complete presentation system built into a rugged, compact carrying case. Reach up to 1,000 people outdoors or in rooms up to 10,000 square feet. Using Bluetooth wireless technology, stream audio wirelessly from your smartphone, tablet, or any other Bluetooth® enabled device. By adding a second Wireless Mic Kit (sold separately) two presenters can be wireless simultaneously with the freedom to roam within a 300 ft. radius. Powered by ten D-cell batteries for up to 200 hours of talk time or choose optional rechargeable NiCad battery pack.