The serial number for a product is a unique identifier assigned to an individual product. This would allow you to uniquely identify your product. If you are unsure how to locate your recorder serial number, below are a few ways to locate it.
The serial number for your product is located on a sticker on the body of the camera or recorder.
If you have devices on OWS, you can find your product serial numbers using Inventory Reports in OWS. More info here: Inventory Reports
You can locate your recorder serial number within the Apex software. To do this, login to your recorder, navigate to Setup>System Settings>Licensing and your serial number will be located on the right side of the page.