Braven BRV-1 is rugged, water resistant speaker made for outdoor uses. The BRV-1 will keep up with you in even the most extreme environment. Use Braven BRV-1 with any device you use headphones with. Plug one end into the IN port on the speaker, and the other into your device. The builtin1400mAh battery can play wireless audio for up to 12 hours.