Suitable for outdoor use, the audio modules are available in zero to three button versions. Buttons are IP68 rated and additionally like the panel are manufactured from stainless steel. The modules can be programmed to set conversation time (1-2 minutes), set the lock release time (2, 4, 8 or 20 seconds) and set the speech mode.
The microphone, loudspeaker and reassurance tone volume can be additionally be adjusted. LEDs are included to give visual indication of the call and door status.