1. Easy to Install: Push the sleeve from the head to the direction of the grip, and push the sight from the bottom and upwards. Then you can adjust the sight left and right until the light is at a 90-degree angle to the clubhead. 2. Master the Swing Feel: The sight helps the player to master the swing feel and can quickly the hook line, allowing the player to correctly master the batting technique. 3. Power Supply: The sight is powered by 3 LR44 button batteries. In the "" mode, lasts only 10 seconds. In the "CON" mode, it can continue to emit light until the voltage becomes low and the light becomes weak. 4. Lightweight and Portable: The sight is small in size and easy to carry, fitting any golf club . Put it on your golf club and you will not feel that your golf club is heavy because it is light. 5. Suitable for Practice: The sight can be connected to all golf clubs. It is suitable for left-handed and right-handed golfers to practice their daily swings to technical accuracy and practice swing feel. Material: Plastic + Metal colour: black Package Contents: 1 x Golf Swing Sight Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.