This gadget is made for wall mounting, features a selection of different tones and volume ranges, a built in brief circuit isolator and is soft addressed for ease of installation. In order to prevent discrimination, BS EN 54-23 compliant VADs may be mounted in all sanitary accommodation (not only WCs) https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/