How do I turn the dryer buzzer on? I have a hot tub dryer (I don't know the model #)...

I have a hot tub dryer (I don't know the model #) and since I have have it, the buzzer has never go off when the cycle be finished. I threw away the instructions (I thought I knew how to work a dryer so I didn't requirement them). How do I turn the buzzer on?
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Answers:    ...with SCIENCE!
? Humidity ?
Try using respectively cycle. If no switch on front and various cycles don't expiration in buzzer, you probably don't enjoy a buzzer. Many dryers do not have a signal to report to you it's finished!!