What are the terms of the Opengear extended product warranty?

Opengear offers a four (4) year warranty on all products we manufacture. 

Extended warranties may be purchased. These extend the warranty to a fifth and a sixth year.  There is no warranty period after the sixth year. A warranty extension can only be purchased while a unit is under a current four year or fifth year warranty period.  No warranty extension may be purchased for a unit that is out of warranty.