Bluetooth control advanced insta sync bluetooth for easy pairing with your device features built in mic for hands free calling anywhere dark bass chamber allows massive airflow for deep precise sound without the bulk chainable with other rock out speakers for a bigger louder party built with a rugged outer shell a roomy fabric lined pocket keeps your gear safe inside the attached bungee lets you strap your speaker anywhere recharges from usb or goal zero solar panels weight 16 oz 4