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LED Pocketwatch v1.0

The pocketwatch also has an alarm function. The alarm is set by holding depressing the stem for 1.5 seconds, whereupon the LEDs will begin to blink. Setting the alarm is handled identically to setting the time. Entering alarm mode sets the alarm on; it will stay on until programming mode is entered, or until the alarm rings. When the alarm goes off, the vibrator inside will pulse in time with flashing LEDs displaying the time.

[Source] Hack-A-Day via LED Pocketwatch v1.0