A. Product 1. **Material**: Nylon 2. **Dimensions**: 17 * 11.5 cm 3. **Color**: Black 4. **Quantity**: 1 piece 5. **Package contents**: 1 training alarm B. Product Features 1. **Usage**: Through the sound emitted by the golf training aid, golfers can detect the error in the bend of their left arm and thus keep their left arm straight. Therefore, an effective way of hitting the ball can be gradually formed. It is suitable for golfers or golf courses, especially beginners. 2. **Sound alerts for incorrect postures**: This golf swing trainer is an integrated alarm device made of special materials. When a golfer bends their elbow during a swing, it will emit a sound to remind the golfer that their posture is incorrect. At this time, the golfer should adjust their posture and keep their left arm straight. 3. **Adjustable and portable**: The swing part of the golf training aid can be adjusted with Velcro and buckles, making it more convenient to put on and take off. The plastic buckles won't scratch the skin like some other thin metal buckles, and it is suitable for most people's arms. 4. **Breathable material**: The golf swing trainer is made of breathable nylon cloth, webbing, and Velcro fasteners. It is durable and lightweight, and won't burden the user.