Description Product Description Material: Nylon Size: 17 x 11.5 cm Color: Black Quantity: 1 pc Package content: 1 x Training alert device 1. Application: This golf training aid uses sound feedback to help golfers detect left arm curvature during the swing, encouraging a straight left arm position for improved swing mechanics. Suitable for all golfers, including beginners and those taking lessons. 2. Sound Prompt for Incorrect Posture: The device is an integrated alarm that emits an audible signal when elbow flexion occurs during the swing, indicating incorrect posture. Users should adjust to maintain a straight left arm. 3. Adjustable and Portable: Features strong hook-and-loop fasteners and a durable plastic buckle for secure, comfortable, and easy adjustment. The buckle is designed to avoid skin irritation. Fits most arm sizes. 4. Secure Fit and Reliable Alerting: Unlike simple strap-style trainers, this device wraps fully around the elbow, minimizing slippage and ensuring consistent, effective feedback. 5. Breathable Material: Made from high-quality, breathable nylon fabric, webbing, and hook-and-loop fasteners. Lightweight, durable, and comfortable for extended use.