Each Deeper Sonar device has its own unique serial number. The serial number serves as your sonar's personal identification code, and is used to determine warranty activation time, special promotions available for your device and many other important details. It's also handy to know the serial number if your Deeper needs servicing or in case it was lost.
The serial number can be found at the bottom of the original box, on a sticker with barcodes. It can also be found on the device itself:
Deeper PRO/PRO+
Deeper CHIRP/CHIRP+
Deeper START
Deeper 3.0