Material: Nylon Size: 17*11.5CM Color: Black Quantity: 1 piece Package Content: 1 piece * Training alerter 1. Application: This golf training aid helps golfers detect left arm curvature during the swing by emitting a sound, promoting a straight arm position. This support aids in developing a consistent and effective swing. Suitable for golfers of all levels, especially beginners. 2. Sound Prompt for Incorrect Posture: The golf swing trainer features an integrated alarm made from special material that activates when the elbow bends during a swing. The sound alerts the user to incorrect posture, encouraging adjustment and maintenance of a straight left arm. 3. Adjustable and Portable Design: Equipped with strong Velcro and a durable buckle, this training aid is adjustable and easy to wear or remove. The thick plastic buckle is designed to prevent skin irritation, unlike thin metal buckles, and fits most arm sizes comfortably. 4. Secure Fit and Reliable Feedback: Unlike basic belt-style trainers, this device wraps fully around the elbow area, reducing movement during use and providing more consistent feedback to help correct swing form. 5. Breathable Material: Constructed from high-quality breathable nylon fabric, webbing, and Velcro fastener, this training aid is lightweight, durable, and comfortable to wear without causing pressure or discomfort.