The perfect view, the perfect beverage, and the perfect song -- it all comes together with the VSSL Flask & Speaker. Built with 304 stainless steel double-walled, vacuum-sealed construction, the VSSL Flask & Speaker keeps beverages at the right temperature, up to 10 hours cold and five hours hot. The 5-watt, removable Speaqua Bluetooth speaker is good 5 hours of music, and can be linked together with a second unit for stereo sound. The flask also addresses refilling with losing any of that great beverage -- the drinking cap unscrews for filling without a funnel, along with a locking carabiner top for secure carrying.