Braven Balance for Bass Optimization.</br>Charge your mobile device using the speaker's built-in 4400mAh Lithium-ion battery.</br>Built-in noise-canceling microphone for hands-free calls.</br>Durable IPX7 certified waterproof rating.</br></br>Product Description</br></br>The powerful Braven Balance speaker is designed with the active individual in mind. Available in sporty color options?? the Braven Balance delivers room-filling sound to enhance your active?? on-the-go lifestyle.</br><br/>http://www.amazon.com/gp/product/B0102ONELA