I have an original Amazfit T-Rex smart watch for sale. It has been an astounding Smart Watch with about 16 days of battery life and there are hundreds of watch faces available on AmazFaces and the Zepp app. The software is available on either the Apple app site or the Windows app site. The watch has a replacement metal link band on it. You can buy replacement bands on eBay or Etsy. The price is $110.00 I prefer EMTs, but will accept cash. Please text me if you have questions.