Features 1. Golf training bag design according to the basic principles of golf swing, to help players master the correct feeling on swinging ball,can quickly corrected the right hook, so players can master the shot correctly. 2. The rod sleeve is pushed from the rod head to the grip direction. The laser is pushed from the lower part aim at the mouth of the bayonet and pushes up. After the installation is successful, adjust the sight left and right until the laser line is 90-degree perpendicular to the rod head. Then you can use it with confidence. 3. 3 x LR44 Button Cell. InINT-Intermittentmode, the light beam last for 10 seconds onlythis is power saving mode InCONswitch mode, this can continue to emit light until the voltage becomes low. 4. Fits easily to any golf club. Small size and easy to carry. Placing this plastic golf putter on your golf club, you dont feel so much weight on your golf club as it is so lightweight. Specification Material: ABS Color: Black Size: 5 x 2 inch Weight: 100 g Package Include: 1x Golf Training Putters