I purchased this along with my Oppo smartphone. I've used it for about three years, but I'm selling it because I've upgraded my phone. I only used the band with the metal fittings (cleaned and disinfected). The other band has never been used. The power adapter is a replacement because the original one broke (used for less than a year). The main unit and the power adapter function without any problems. All original accessories, including the box, are included. Thank you.