Experience remarkable audio with the boomBOTTLE. Rugged, wireless mobile speaker fits right inside your bicycle water bottle cage. The boomBOTTLE has been designed to bring entertainment to the outdoors. This wireless Bluetooth mobile speaker is weatherproof and durable, allowing you to take your music virtually anywhere. Dual 40mm drivers and passive subwoofer produce impressive audio and improved acoustics. Works with all Bluetooth streaming A2DP audio devices including iPhone, iPod touch, iPad, Android Devices, Smartphones, Tablets, Laptops, and more. IPX4 splashproof construction 8.1"L x 2.9" diameter.