The brv-360 is IP67 waterproof and designed to withstand rain, waterfalls, and dunks in lakes. Dual passive radiators with custom, in-house tuning produce smooth, consistent, 360-degree sound. The brv-360 fits easily in cup holders and water bottle cages, and is lightweight enough for backpacks, sports bags and purses. Built-in voice control Works with your smartphone for commands and hands-free calls. The brv-360 sounds incredible at distances up to 100 feet.