HamiltonBuhl 6 Person Wireless Listening Center Go Wireless in your classroom with plug and play simplicity. The W906-MULTI is a 6 person Wireless Listening Center perfect for all multimedia lab and classroom applications. Each system includes one transmitter and six wireless headphones. The entire system can be switched between 4 different frequencies with easy color-coded switches. Add additional transmitters and youll have up to 4 different channels of audio simultaneously!