17 appealing polyphonic melodies (2-/3-sound, Westminster, pop, classic, special call sequence for the hearing impaired, etc.) and silence function with LED control. Alarm function with DIN emergency tone for special situations. User-friendly selection of melodies and 500mJ flash. 4-step slide switch for setting the ringing signal (1 melody/flash, 2 melody only, 3 flash only, 4 mute). Stepless volume control. Waterproof combi radio push-button with name plate and LED transmission control. 13 call differentiations for optimal access control. Central call: several receivers can be controlled by one transmitter. Individual call: each receiver can be controlled individually by additional transmitters. Matrix call: combination of central and individual call possible. Receiver/transmitter pre-programmed ex works. Simple teach-in of further transmitters at the push of a button.