The OBD Genie can only be used in one vehicle. This acts as an insurance policy. They are dedicated to your vehicle's VIN number for life. If you deactivate the feature you programmed, you can re-activate it again anytime with your OBD Genie. We offer discounts on orders with multiple programmers. If you are looking to purchase more than one, please reach out to support@obdgenie.com and we will gladly set you up with a discount.