I have the garmin 255wt and the box said 255wt but the unit said 255w and the instructions were for a 205 but thru trial and error and the help of forums I came up with the solution that the power cord has to be plug in and in the area that has fm and when it asked you for the ativation code you dont need it for lifetime subscriptions it just works
Service Information 
The Traffic Subscription Code cannot be reused; you must obtain a new code each time you renew your service. The code is specific for the GTM 20 it was purchased for; it cannot be ...
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