Tik Tok Sound Alerts Wrong Posture: Golf Swing Trainer elvow is an integrated alarm device made of special material that immediately produces a sound if you bend your elbow while swinging. You will be warned that your posture is incorrect; you should adjust your posture to keep your left arm straight. Application: Thanks to the sound of our golf trainer, golfers can detect the incorrect bending of their left arm to maintain a straight position; thus, an effective and ideal strike can be formed gradually. Suitable for all golfers or golf lessons, especially for beginners. Posture Warning: During use, when the elbow is bent, it will issue a warning for incorrect posture. Then correct yourself by stretching your arms so that you gradually achieve an effective swing effect. Suitable for all golfers or golf instructors, especially for beginners. Breathable Material: Our golf swing training aid is composed of high-quality, breathable nylon cloth webbing and hook-and-loop fasteners, durable and lightweight; it will not bring you pressure. With a high degree of flexibility, you can easily place your elbows in the armband to create and maintain the correct distance between your left foot and right knee. Not easy to shift, enhanced warning: Compared with other suppliers who use a simple belt, our golf swing trainer is designed to stay securely at the elbow, providing more reliable feedback to the golfer.