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Just bought one that had rave reviews. And just as I took it on the road it disconnected entirely after immediately connecting and now I can’t get it to work. Mercedes has the worst electrical luck.The model we bought works - just plug it in before you start the vehicle. If you look for the other threads on this on this forum (which should appear as "recommended reading" below this thread) you will find other owners that have used a number of different such devices with success. Pounce is correct as many of the devices are available on Amazon and have free shipping and returns (provided you are a Prime member).