Plug-in the Garmin GTM 20 GPS receiver into your GPS device and stay updated with the traffic information to avoid heavy jams. This Garmin Automotive GPS receiver provides you with the traffic information of North America. While driving you will be alerted by this Garmin GPS accessory if there are jams, accidents, or any on-going construction work. The Garmin GTM 20 GPS does not require any kind of installation; just plug it in to use it. This Garmin Automotive GPS receiver features a self-contained antenna, traffic link and a 12-volt cigarette lighter adapter, for added convenience. The traffic information is received by this Garmin GPS accessory via a silent FM data channel, so you can enjoy music on FM without affecting the incoming traffic alerts.