The EcoZoom Versa and Dura does not have a serial number. Instead, you can register this product by entering your EcoZoom order number into the serial number section.
For orders placed on BioLiteEnergy.com, your order number will start with "S1....." For orders placed on Amazon, your order number will look like this 1##-#######-#######. Please note your order number and confirmation number are not the same.