Instruct: Classify Amazon reviews into positive or negative sentiment
Query: adapter is useless

This adapter only has a 500ma rating, had I known that I would not have purchased. I bought this to power my Sirius SAT radio while indoors but 500ma enough to even power the SAT receiver. Don't buy this one, look for something with a higher amp rating, probably .5 to 1 amp would do if you could find one. I ended up making my own with an old router power supply and cig lighter socket purchased from the local auto store. The power supply I used is rated at 12Volts/1Amp and it works nicely