Application: Invite the golfer's incorrect posture by vibrato, then correct it yourself to straighten the arm, so as to gradually form an effective and ideal way to hit the ball; suitable for all golfers or golf guides, especially beginners [Tiktok invites bad posture]: built-in special material alarm device, when the elbow is bent, vibrato will be issued immediately ; it reminds you that the posture is not correct, you should adjust the posture and keep the left arm straight. [ADJUSTABLE AND EASY TO WEAR]: Strong hook and loop and loop make it adjustable and easier to put on and take off; the thick plastic buckle will not scratch your skin [Non-slip & Best Warning]: Our golf training aid swing can be worn over the entire elbow, not easy to move, while giving a warning when the arm is bent. [Breathable Fabric]: This golf training aid swing is made of high quality nylon breathable fabric, webbing and hook and loop closure, durable and lightweight without putting too much strain on your elbows. Packing list: 1 * trainer We only sell sneakers, not other items in the pictures. Due to the difference between different monitors, the pictures may not reflect the color actual item. Due to manual measurement, please allow slight errors in size.