The acoustic telephone call signalling devices are particularly well equipped for use in areas exposed to extreme environmental influences. The tough housing withstands rain, high air humidity, heat and cold as well as the influence of acids, alkalis and grease. The user can select between a single-tone, two-tone, threetone or warble tone ring with the help of internal DIP switches. Four different tone sequence frequencies can also be selected in a range between 5 and 20 Hz.
Data
sheet (PDF) User
Manual (PDF) 