KitchenAid Pro Line KPWB100 Use & Care Manual page 12

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Timer Memory
Baking timer will remember the last time set, even when the baker
is unplugged.
Message Tones
Convenient tones instantly convey waffle baker status. A tone will
sound when the baker is fully pre-heated. When the baking timer
reaches zero, the baker will produce a series of tones.
Constant Temperature Baking
Baker has no adjustable thermostat: waffles bake at a constant
temperature optimized for the best results. Browning of waffle is
controlled with the baking timer.