http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/D1660om.pdf
You can silence the ringers on all handsets for a specific period of time.
English - 10
1. With the phone in standby, press and hold # on any handset. The phone
prompts you to select the number of hours (1 - 9 or Always On) that you
want it to stay in silent mode.
2. To confirm, press # or just wait about 5 seconds. The phone displays Silent
Mode On on each handset.
3. After the selected number of hours, the phone automatically exits silent
mode. To exit silent mode manually, press and hold # again.
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