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 a swing by emitting a sound, promoting a straight left arm position for improved swing mechanics. It is suitable for all golfers and golf instruction, particularly beneficial for beginners. 2. Sound Prompt for Incorrect Posture: The golf swing trainer features an integrated alarm system made from special materials that activates when the elbow bends during a swing. This alerts the user to incorrect posture, encouraging immediate adjustment to maintain a straight left arm. 3. Adjustable and Portable Design: Featuring strong Velcro and a secure buckle, this training aid is adjustable and easy to wear or remove. The durable plastic buckle is designed to prevent skin irritation, unlike thin metal buckles, and fits most arm sizes comfortably. 4. Secure Fit and Effective Feedback: Unlike basic belt-style trainers, this device wraps fully around the elbow area, minimizing movement during use and providing more reliable feedback to help correct swing form. 5. Breathable Material: Constructed from high-quality breathable nylon fabric, webbing, and a Velcro fastener, this training aid is lightweight, durable, and comfortable to wear without causing pressure or discomfort.