Uniden SSE33 Owner's Manual page 9

adjust earpiece Volume
The switch to adjust the earpiece volume is found beneath the handset. Switch
between '+' to increase the earpiece volume and '-' to decrease the earpiece
volume.
adjust speaker Volume
The switch to adjust the speaker volume is found on the right side of the
telephone, slide the switch to increase or decrease the speaker volume.
adjust ringer Volume
The switch to adjust the ringer volume is found beside the DC IN port. There are
3 adjustable volume levels - low/middle/high.
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