Feature 1. The design of the golf training bag is based on the basic principles of golf swing, helping players master the correct swing sensation, quickly correct the right hook, and enable players to master the hitting correctly. 2. Push the rod sleeve from the rod head towards the grip direction. The laser is pushed from the bottom, aimed at the mouth of the bayonet and pushed upwards. After successful installation, adjust the sight left and right until the laser line is perpendicular to the rod head by 90 degrees. Then you can use it with confidence. 3.3 x LR44 button battery. In "INT intermittent" mode, the beam only lasts for 10 seconds, which is a power-saving mode. In the "CON" switch mode, it can continue to light up until the voltage drops. 4. Suitable for any golf club. Small size, easy to carry. Place this plastic golf putter on your golf club, you won't feel that the golf club is very light because it's very light. Specification and Material: ABS Color: Black Size: 5 x 2 inches Weight: 100 g Package includes: 1 Golf Training Putter Excluding batteries