1. Check the bottom of the box, you should see the model number near the bar code.
2. Check the back or bottom of the main unit, it should have a rating label that shows your model number.
3. Check your manual. Your product’s model number is listed on the front cover of your instruction booklet.
This article contains the AZ3900UKT Series Shark POWERDETECT™ Upright Vacuum Owner's Guide.