Analogue door intercom with 1 bell button, moisture protection according to class IP 33. Large illuminated doorbell sign, 1 switching relay, 1 potential-free switching output in conjunction with optional plug-in power supply! Aluminum housing, height only 22 mm, intended for surface mounting. Compatible with AS systems as well as many telecommunications systems from other manufacturers (including analog extension) and optimally coordinated (plug'n'play) for AGFEO ES systems! HyperVoice operation only via adaptation.