It may not look like much but the D2 Swing Trainer is promising to make you a better golfer, according to lots of golf pros (who we promise haven't been paid lots of money by the manufacturer for their endorsement).

It has clever built-in weights that make it hard for the golfer to backswing incorrectly, which means their technique will improve and their shots will get more accurate.

It costs $100 but who can put a price of beating your mates on the course?