The reset button on the Hub will wipe the saved WiFi configuration. You can also hard reset the Hub by unplugging, holding the reset button down and reapplying power. Devices are reset by pressing and holding the LED button next to the battery door.
AIR/SKY Frequencies
915 MHz: Australia, Canada, Israel, Japan, New Zealand, Singapore, Taiwan, United States
868 MHz: Everywhere else
In regards to warranty and ownership transfer - it is not an uncommon practice for the manufacturer to offer a warranty transfer. Usually a form is involved. @WFmarketing, thoughts?