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It's at this stage in the conversation that one will usually be pointed to the search function on this lovely forum. This will help you in discovering 5000 other threads asking the same question.
Seeing as I typed all that may as well say - it allows you to remap the Ecu and gives more detailed live data than a cheaper obd2 reader but isn't quite as fully function as clip that garages have. You can also get extra moduals for airbag light and ting. X