Does the cube tracker have a monthly fee?

Excuse me, I'm wondering if you could clarify something for me. In regards to the cube tracker that you're offering, does it come with a monthly fee? I'm considering purchasing it but I want to make sure I understand all the costs associated with it before I make a decision. Could you please elaborate on whether or not there is a recurring charge for using the cube tracker on a monthly basis? Thank you for your time and assistance.