Honeywell Domonial User Manual page 6

Understanding the audible acknowledgements
SOUNDERS
The sounder, whether it is built in the control panel 1 or mounted in the house (optional)
2 is an effective deterrent due to its power and very irratating tone.
Both these components emit an audible confirmation of your arming and disarming
the security system. The volume levels can be adjusted by the installer.
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2