To find the serial and model number you will need to remove the reservoir.
The model and serial number are located on the motor housing under the blue reservoir.
All serial numbers are imprinted in the label on the bottom of the unit. Newer models also include the model/serial combination located in the plastic.
"After using this product for several months now, I actually get comments about how nice my teeth look. My gums are healthier, cleaner, and less sensitive.“