This Bluetooth Music Tube Speaker by ALPHA offers a powerful and clean sound. Designed for the outdoors, it’s cylindrical shape and waterproof feature makes it ideal for cyclists and hikers. Featuring the latest CSR 4.0 technology, this speaker provides crystal clear Bluetooth streaming and twin bass ports for an enhanced depth of sound. The Music Tube bluetooth speaker is the perfect size to drop into your bike’s drinks holder or into the side pocket of a hiking backpack. Surrounding the base is a soft ring of rubber that offers a great point of contact for standing the speaker up. This prevents any vibration when placed upright on a hard surface.