Keep your "tuned" Ram truck safe from dealer updates! This is an OBD II port lock for Ram trucks. The Tune Saver is designed to keep unauthorized persons from accessing your truck's computer through the OBD II port: prevent the dealer from uploading software updates to the control logic or changing performance parameters; prevent maintenance, performance, or vehicle history data from being downloaded; and prevent vehicle specific data (such as electronic key codes) from being downloaded. The Tune Saver is a tool of total prevention of access to the OBD II port, or a tool of informed consent to get the dealer to divulge completely his intentions for your Ram truck's computer. Each Tune Saver purchase comes with one Pocket Secure Key. Extra Secure Keys can be purchased from the Keys page. The locking mechanism is located behind the main body of the lock when installed on the OBD II port. Manufactured entirely in the USA of billet aluminum, polycarbonate and stainless steel. This lock is designed for OBD II ports on Ram trucks, but can be used on any vehicle's OBD II port with the same features and access as the Ram OBD II ports.