|Internal transmitter and receiver allow a presentation away from the lectern for more interaction with audience. Wireless lapel mic and dynamic handheld mic for convenience and voice quality. Elegant cabinet styling with storage for presentation supplies. Two 6 x 8 tapered oval full-range Jensen design speakers for high audio quality. Four casters let you roll it wherever you need it, then two locking casters secure it in place. Runs on ten D batteries or AC adapter or converts to a rechargeable system with AC adapter and NiCad battery pack.