Activeforever Geemarc AMPLI600 Emergency Response Phone - Manual (Page 32)

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Handset Amplifier
In both cases, you can also boost the reception volume by an extra 12 dB
by holding down the handset amplifier button located on the handset.
Note: The button must be released while talking or it will act as a mute
button
Caution: Exposure to high amplification levels to people without hear-
ing loss may cause damage to hearing.
VOLUME AND TONE