50 Watt multimedia stereo amplifier reaches up to 1,000 people outdoors or in rooms up to 10,000 square feet. Stream audio from any Bluetooth equipped smartphone or tablet. Includes built-in 16-channel UHF wireless receiver lapel and headset microphones with wireless transmitter bodypack. Three microphone inputs (dynamic, condenser, wireless). Connect to other audio devices for enhanced playback or recording. Weatherproof and scuff-resistant molded black luggage-type plastic case holds up to abuse and protects amplifier. Case contains sturdy foam shell for storing microphone and accessories. Runs up to 200 hours with ten D-cell alkaline batteries (not included), or use the optional rechargeable AmpliVox S1465 NiCad battery pack with S1460 AC adapter/recharger. Dual wireless capability: two presenters can be wireless (with second optional wireless mic kit - sold separately).