The Praesensa ambient noise sensor monitors the ambient noise level and alerts the system controller about changes. Announcements are then automatically adjusted to a comfortable level above the noise to ensure intelligibility. The noise level is sampled and the latest level information is held and used during the call. Tracking mode is used for background music, allowing the continuous adjustment of the background music’s volume to suit the environment. The device is water resistant (IP54) with or without the back box and can be used indoors and outdoors.
Source: https://www.helpnetsecurity.com/2021/07/30/bosch-praesensa-ambient/