Super portable, the Dynamo is the king deckside or in the pool (H20 Version) for teaching, and versatile enough to use for just about any facility function where small group sound is needed. 30 watts of power with a 6" speaker for small group aquatic exercise classes or other facility small group sound needs. Completely portable -rechargeable battery (with built-in charger) or plug it in and run it from standard AC - take it where you need sound. The built-in Fitness Audio wireless receiver allows you to use a dry Fitness Audio body pack transmitter and E mic or Aeromic headset or handheld transmitter for deckside instruction, lecturing, making announcements, or multimedia presentations. The H20 Version includes a Waterproof - In Pool - AMA Baqua VHF Transmitter, Headset, Charger, and Baqua Harness for in water teaching. Dynamo covers all of your music needs for fitness - built-in CD/MP3 USB player with pitch control and remote plus additional audio inputs to add the most popular personal MP3 players on the market. Optional travel bag and tripod stand. Not intended for in water use or splash proof - water damage is not covered under warranty.