1. Application: Through the sound of our golf training aid, golfers can detect their left arm curvature error in order to keep the left arm in a straight position; Therefore, an effective and desired blow can gradually be formed; Suitable for all golfers or golf lessons, especially beginners.2. Sound Prompt Incorrect Posture: The golf swing trainer is an integrated alarm device made of special material that immediately generates a sound when you bend your elbow while swinging. It alerts you that you are not in the correct posture; You should adjust the posture and keep your left arm straight.3. Adjustable and easy to carry: Strong Velcro and buckle make the golf training aids swing adjustable, easier to put on and take off; The thick plastic buckle does not scratch the skin like other thin metal buckles; It suits most people's arm.4. Not easy to change and better to warn: Compared to other suppliers which is a simple belt, our golf swing trainer is around the entire elbow, ours is not easy to move and it can better warn golfers5. Breathable material: Our golf swing training aid is made of high quality, breathable nylon cloth + webbing + Velcro fastener, is durable and light; It won't pressure you.Quantity delivered: 2 piecesPackage Contents: Only the above package contents, excluding other products.Size: 17*11.5cm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)Colour: Black(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)