1. Easy to Install: Slide the sleeve from the head toward the grip, then insert the sight from the bottom upward. Adjust the sight left or right until the light is at a 90-degree angle to the clubhead. 2. Improve Swing Accuracy: The sight helps players align their swing path and improve swing technique for better shot consistency. 3. Power Supply: The sight uses 3 LR44 button batteries. In "STD" mode, the light lasts for 10 seconds. In "CON" mode, the light remains on continuously until the battery weakens. 4. Lightweight and Portable: Compact design makes it easy to carry and install on any golf club. Its lightweight construction ensures it does not alter the feel or balance of the club. 5. Suitable for Practice: Compatible with all golf clubs and suitable for both left-handed and right-handed players. Ideal for daily practice to enhance swing alignment and technique. Material: Plastic + Metal Color: Black Package Contents: 1 x Golf Swing Sight Note: Light and screen display settings may cause slight variations in color. Measurement may vary by +/- 1-3 cm.