New, unused. Opened for photography. Functionality has been confirmed. KEEPINGCOREBAND Experience training just by wearing it. Wear it with your abdomen tightened 1-2cm from your navel towards your back. It detects changes such as core loosening or loss of abdominal strength and alerts you with vibrations. The wearer repeatedly contracts their abdominal muscles voluntarily, developing a habit of using their abs. It is expected to lead to a healthy and beautiful body. Thank you.