If you've ever spoken to or had golf lessons, you'll know just how crucial it is that your golf swing is "on plane". By simply placing another golf club, an alignment rod or drawing a chalk line on the ground or driving-range mat, the Plane Trainer will instantly show you whether you're swing is over or under plane and you will very quickly pick up the feel of that on plane swing. Simply attach to the bottom of your golf club and switch on. The Plane Trainer will give you 3 reference points during a full swing to see if you're on plane. The backswing, the downswing and the follow through. This training aid also includes a BUTTON PROTECTOR that clips onto the product to prevent the turning on whilst in your packet/bag when not being used and draining the batteries. Easily attaches to almost any golf club. Suitable for right and left handed golfers. Suitable for men, women and children of all ages. Ultra compact size and sleek design. Power: Less than 5mW Colour:Photo Color Material:Metal Package Contents: 1 x Golf Swing Corrector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.