Whoop 4.0. The black band is brand new. The battery and sand colored band are used but in good condition. The QR code in the box will set you up with two free months to try whoop. After that you have the option to get your own membership. I LOVE whoop, it changed my life and my health. I just upgraded to the newer version. But I’ve been using the 4.0 for several years and it is great.