1Easy 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. 2Master the Swing Feel: The sight helps the player to master the correct swing feel and can quickly correct the correct hook line, allowing the player to correctly master the batting technique. 3Power Supply: The sight is powered by 3 LR44 button batteries. In the "INT" mode, the beam lasts only 10 seconds. In the "CON" mode, it can continue to emit light until the voltage becomes low and the light becomes weak. 4Lightweight and Portable: The sight is small in size and easy to carry, fitting easily any golf club easily. Put it on your golf club and you will not feel that your golf club is heavy because it is very light. 5Suitable for Practice: The sight can be easily connected to all golf clubs. It is suitable for left-handed and right-handed golfers to practice their daily swings to improve technical accuracy and practice swing feel. Description: 1The sight can be easily connected to all golf clubs. It is suitable for left-handed and right-handed golfers. 22 Modes: The sights are two modes, "INT" automatic mode and "CON" continuous mode. We recommend that you use CON mode only for aiming at your sight. Material: ABS Size: about 12.7*5*1.5cm/5*2*0.6inch Weight: about 40g Packing List: 1 * Golf Swing Sight Notes: Due to the lighting effects and shoot angles, there is a color difference in the product, please understand. Due to manual measurement, there is tolerance in the product size.