Enjoy a weatherproof, rechargeable, and wireless speaker with a built-in mic, that meets the demands of the pickiest, most adventurous audiophile. Big Sound DarkBass chamber allows massive airflow for deep, precise sound without the bulk. Mic Built-in doubles as a rugged speaker phone. Answer incoming calls from your crew. Bluetooth connect and rock out wirelessly using one-touch Bluetooth technology. Adventure ready- use the elastic cord to attach the speaker to your pack or ride.