The original Cap has been updated with a new functional geometry, which adds even more utility to this rather useful component of our battery-free device. The new design includes two indentations to help the Cap to stay on while also allowing for a more even distribution of the airflow, as well as an improved tactile indication of both the heat up and cool down clicks. In addition, it allows for the free movement or spin of the cap. The Captive Cap is compatible with all DynaVap devices.