Isinor is correct.
The OWS and DBC213 all provide visual feedback for the call progress if Mode = 0. (default)
Mode = 1 is for the visually impaired, it provides the same visual feedback plus special audible tone indications.
If a person is working alone in a dangerous environment, there is a requiremenmt that the worker regularily confirms he/she is OK. Can a telephone be programmed to raise an alarm if not used within a 10 minute interval?, or similar solution?
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