Well, after I ordered the wrong polar heart monitor initially I am delighted with this baby! I am a big fan of Nike + and recently invested £180 in the Nike+ GPS Watch which I'm also really pleased with. This monitor works with an Ipod, Nike+ Sportsband and most importantly to me.... the Nike+GPS Watch. All that is required to set it up is go into the Run Menu, Go to Options and select new sensor. The heart rate monitor is then discoverable as long as you are wearing it correctly having dampened the strap as shown in the manual. Jobs a good un! An hours running later, all the heart rate anlysis is uploaded and you can even set and analyse the desired zones of your heart rate! A great gadget.... but it really is more than this if you are a serious runner! Well done Nike, it's coming together slowly!