Dimensions: 8.5cm x 2cm Weight: 25g Batteries: Includes 3 coin cells <5 mW Improve your Swing Skill, guide you into the proper Swing Plane while you swing. A great golf swing Posture Corrector for Indoor and Outdoor Practice. Simple to use ON/OFF Button, 3pieces Battery Included. Easy to replace new battery. Suitable for all golfers---suitable for right or left hand golfers. Easy to fix on the bottom of grip. It's only 25g which will not add too much weight for your club.