In standby mode use up-arrow and down-arrow on the handset or the volume+ and volume- on the base to change the ringer volume.
While on the phone, use the same buttons to change the volume.
If you need a manual, you can download one from the manufacturer's web site at
http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/DECT1580om.pdf
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