For a playing time of 59 minutes or less, press and hold down SLEEP. Then repeatedly press (or press and hold) MINUTE until the display shows the desired minute setting.

For a playing time between 1 hour and 1 hour, 59 minutes, press and hold down SLEEP. Then press HOUR until the sleep timer passes 0:00 and 1:59 shows on the display. Contin- ue to hold down SLEEP and press MINUTE until the display shows the desired setting.

To turn off the sleep timer before it automatically turns off, press SNOOZE.

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Radio Shack CHRONOMATIC-312 owner manual