Application: Through Tik-tok sound to warn their incorrect posture to golfers, and then correct by self to make arm in straigh, therefore it can gradually form effective and desired hitting; Fit all golfers or golf instruction, especially works great for beginnersTik-Tok Sound Prompt Incorrect Posture: Built-in alarm device which made of special material makes a Tik-Tok sound immediately if you bend your elbow when golf swings; It prompt you that you are not in correct posture, you should adjust posture and keep left arm on straightAdjustable and Easy to Wear: Strong hook&loop and buckle make it adjustable, easier to put on and take off; The thick plastic buckle will not scratch your skin; It fits for people whose elbow circumference is below 33cmNon-Slip and Better Warning: Our golf training aid swing can be worn around the entire elbow, not easy to move and meanwhile give a warning if your arm is bendBreathable Fabric: This golf training aid swing is made of quality nylon breathable cloth, webbing and hook&loop closure, durable and lightweight, never give much pressure to your elbow