The AudioRock Outdoor System is a perfect addition to any dock, deck, pool or backyard get together. Completely wireless no power cable, no speaker wire. Rechargeable Lithium-ion battery, 8-10hrs run time, 3-4 hrs charge time. AudioRock is totally weatherproof. 2 Zone, 2 source capable. Add up to 8 AudioRocks for sound all around your yard, cottage or event. AudioRock System includes: 1 AudioRock 1 Transmitter 1 Remote.