Thank you for viewing. This is a replacement strap for the Angel Heart watch, model number TT25P-PK. It was used once for about an hour. After that, it was stored in its box. I am listing it for sale as I have no plans to use it in the future. If the strap width is suitable, it may be possible to use it with watches other than Angel Heart, but please do so at your own risk. The instruction manual is included. Please refer to page 6 for the replacement method.