Genuine Toshiba owner's manual. Couldn't really ask for more. And written in understandable English in contrast to a few recent experiences I have had with manuals for other equipment other than Toshiba but made in China and written in "Chinglish"!
Text excerpt from page 1 (click to view)
Module Nos. 549/689/690/874/1846
[Module Nos. 549/689/690/1846]
Display automatically returns to alarm mode display if no button is pressed for 2 to 3 minutes.
Alarm and time signal sound.
Alarm and time signal do not sound.
Alarm only sounds.
Time signal only sounds.
Display automatically returns to dual time mode display if no button is pressed for 2 to 3 minutes.