Medicus PowerMeter.  No box.  Instructions are easily downloaded from Medicus website.  Go to golf resources at bottom of first page, then look for Power Meter manual midway down next page.  I bought this new and used it very little.  The past two years batteries have been removed and it has not been used at all.  Back problems, can't golf.  I tested this today and it works perfectly.  If you happen to be 5' 10" and want to put it on your driver, then no adjustments are necessary.  Just attach a couple inches below the grip on your club, hold the "grip" button down on the PowerMeter, and swing away.  Of couse, adjustments are no problem.  A very simple device.  Can be used on woods and irons.  This is fully functional and ready to go.  Does not look brand new, but, as I said, it has been used very little, maybe 10 or 15 times max.  Let me know if you have any questions.  Thanks.