The built-in Fitness audio wireless receiver allows to use a dry Fitness Audio body pack transmitter and E mic or Aeromic headset or handheld transmitter for lecturing, making announcements, or multimedia presentations.  The Challenger covers all of music needs for fitness with optional built-in Bluetooth music streaming, CD/MP3 USB player with pitch control and remote, and additional audio inputs to direct wire any line ready audio source.  Optional travel cover & tripod stand.