This is a new (Sept 2008) version of the TomTom add-on that gives live traffic updates to your TomTom. It is only compatible with the current and recent models of TomTom, so check compatibility before purchase (520, 720, 920, 530, 730, 930, ONE XL, XL 30 series, TomTom ONE 3rd Edition, TomTom ONE 30 series).
Earlier versions of this product were very problematic, but this new version is claimed to have solved the problems. This is a very good price compared with other sellers. I have ordered one for my Go 720, I hope that it lives up to its claims!
The TomTom RDS-TMC Traffic Receiver gets traffic information to your TomTom. For the one-off cost of the receiver you can get traffic updates and let your TomTom reroute you around congestion.
Technical Description: TomTom RDS-TMC TRAFFIC RECEIVER (USB)EU . - 9V00.101 (SatNav GPS Antenna) The TomTom RDS-TMC Traffic Receiver gets traffic information to your TomTom. For the one-off cost of the receiver you can get traffic updates and let your TomTom re-route you around congestion. By simply connecting the RDS-TMC Traffic Receiver to your TomTom device and the car charger, you will automatically receive traffic information via the TMC connection. Once a journey is planned, traffic alerts which relate to the route are clearly displayed in the traffic bar on the right hand side of the screen. When you tap the icon shown in the traffic bar, you will receive further information, such as the cause or kind of delay to traffic, such as an accident or traffic jam. RDS-TMC is available in: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Italy, Netherlands, Spain, Sweden, Switzerland, United Kingdom and selected regions in the United States and Canada. This accessory requires the latest version of the TomTom application. Connect your TomTom device to your computer and use TomTom HOME to update your application automatically and for free.