Features 1、1. [Scientific design] The golf training package is designed according to the basic principles of the golf swing to help players grasp the correct feel of the swing ball, quickly correct the correct hook, and allow the player to correctly master the pitching. 2、2. [Easy to install] The sleeve is pushed from the head to the gripping direction. The red light is pushed from the bottom to the bayonet and upwards. After the installation is successful, adjust the sight left and right until the red light line is 90 degrees perpendicular to the clubhead. Then you can use it with confidence. 3、3. [Power supply] 3 x LR44 button batteries. In the "INT-Intermittent" mode, the beam only lasts for 10 seconds. In the "CON" switch mode, the energy-saving mode can continue to emit light until the voltage becomes low and the red light becomes weaker. 4、4. [Lightweight and portable] can easily fit any golf club. Small size and easy to carry. Put this plastic golf putter on the golf club, you won't feel its weight is too light. Name: Golf putter sight Material: ABS Battery: 3 x LR44 button batteries Size: as shown in the picture Package List 1*Putter Sight