i was approuched by the kenwood rep and was telling me there is a new product out by at autosport that actually will convert your oem keyless into a security/convenience upgrade... its a module that plugs into the data bus on 2000 and up mercedes that use the infra red key.... it increases the range from 30 inchs to 150 feet or more new features include one button operation of the following ..opening and closing windows , sunroof, convertable tops,headlights, car finder, and audio confirmation. it is recognized by the sercurity system as a factory accessory. so it wont trip sensors on the can bus. in addition it provides other options as reverse, door trigger, and shock sensor input, keyed ignition...it takes about 20 minutes to install and no programming is required..he said mercedes offers it from about 900 dollars and up but he can sell me one for 300.00 since mine is a 1999 i m not sure if it will work but just throwing something out there for you people who want better range and better security to your car...