I don't know, but I do know that the printer is excellent and I am very satisfied.

It is really a six-month trial. The only annoyance is that they decide when to send you the cartridges based on the number of pages printed. They only sent me the first refill and then that was it. Then the subscription is triggered, which you always pay for without them sending you cartridges.
The printer is very preformant but I wouldn't consider the six months free for choice.