Get Jupiter Jack 2 for 1 offer Click Here

The second unit is free but costs another $6.99 to ship, that was an obvious one. But the dashboard mount is $9.99 additional and there is no way to get just one! It will automatically send one for the Free unit as well. So the $20 product with a free 2nd unit quickly becomes a minmum $54 of hard selling. You will be barraged with additional unit offers with no S&H, then upgrade options, extended warranty and battery add ons that will kick up your purchase price based on the number of units ! Never once did I see a back up button. This item better do what it says it can. After all, during the order, they themselves pitched another model that is clearer and more powerful than the model in the original offer ! Use a credit card that stands behind you as well as mine for returns just in case. Good luck clicking through those answers.