Feature: 1. Suitable for right- or left-handed golfers. 2. Easily attaches to the end of any standard golf club grip. 3. Projects a flat red laser beam during the swing to help visualize swing plane and identify positioning errors in real time. 4. Supports swing posture improvement and enhances consistency and quality of each swing. 5. Simple and intuitive to use. Specification: Material: Metal Size: 8.5 x 1.9 cm (3.34 x 0.74 inches) (approx.) Package Includes: 1 x Golf Swing Corrector Plane Training Aid Product Usage & Instructions: 1. Attach the device to the club grip. During the swing, observe the projected red beam to assess swing plane alignment. 2. If the red beam points backward, the swing plane is too steep. If it points forward, the plane is too flat. When the beam points directly at the golf ball, the swing plane is optimal. 3. Insert one LR44 battery (not included), secure the battery cover, and mount the device onto the grip end.