Siemens Motion SX binax User Manual page 17

When wearing the hearing instruments, an alert tone can
indicate when an instrument is being turned on or off.
When the power-on delay is activated, the hearing
instruments turn on after a delay of several seconds.
During this time you can insert the hearing instruments
into your ears without experiencing unpleasant feedback
whistling.
The "power-on delay" can be activated by your Hearing
Care Professional.
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