Garmin GTM 20 with Lifetime Traffic See below for compatible Garmin models Self-contained antenna and 12-volt cigarette lighter adapter Warns of traffic jams, accidents, emergency activity, and construction Sends real-time traffic information to your compatible Garmin navigator Lifetime free subscription to traffic-information service Sends real-time traffic information to your compatible Garmin navigator Warns of traffic jams, accidents, emergency activity, and construction Lifetime free subscription to traffic-information service Self-contained antenna and 12-volt cigarette lighter adapter See below for compatible Garmin models