MOJO Outdoors Loud Mouth External Speaker RAISE THE VOLUME: Designed for the Double Trouble Calling System and other audio devices that use a 3.5mm audio port EASY TO TRANSPORT: Horn speaker that is very portable FLAWLESS DESIGN: Comes with a specially designed attachment strap that allows it to be attached along the side of the Double Trouble CAMOFLAUGE: Same brown color to match Double Trouble VERSATILE: Comes with 8' of cable