This excerpt taken from the DXCM 8-K filed Jan 28, 2009.
The initial term of this Commercialization Agreement shall be 3 years (the Initial Term) from the Commercial Launch Date, but no later than 3 years after June 30, 2010. At the end of the second year of the Initial Term, an additional year shall be added to the Term, unless either party gives the other party written notice prior to that date that it intends to terminate this Commercialization Agreement at the end of the Initial Term. Thereafter, a year shall automatically be added to the end of the then current Term at such date as is one year prior to the end of the then current term, unless either party gives the other party written notice by such date that it desires to terminate this Commercialization Agreement at the end of such Term. The Initial Term along with any extensions shall be referred to in this Commercialization Agreement as the Term.