the brv-360 is ip67 waterproof and designed to resist rain, waterfalls, and dunks in lakes. Dual passive radiators with custom, in-residence tuning produce easy, consistent, 360-degree sound. The brv-360 fits without problems in cup holders and water bottle cages, and is lightweight sufficient for backpacks, sports bags and handbags. Built-in voice manage works along with your telephone for instructions and hands-unfastened calls. The brv-360 sounds outstanding at distances up to one hundred feet.