This product was reccommended to me and is as good as I was told. It is somewhat similar to Tiger Balm (which is also very useful), but is more powerful. I put it on my knees and did Taekwondo for 2 1/2 hours with no problems at all. It is soothing and makes you feel a little bit numb. It does have a strong smell but it is not a bad smell and is definitely worth it for the effect.
I was pleased when this watch first arrived, but after only a few months it started losing time. I thought it could need a new battery but could not take the casing from the back. Shortly afterwards it got wet when I was caught in the rain and then the hands were out of sync (when the big hand was at 12, the small hand was not on a number). I have binned it.