Thank you for viewing. This is a replacement band for the Xiaomi Smart Band 9 Active smart watch. It uses TPU material that is resistant to scratches and dust, and is water-resistant and durable. ※ How to attach/detach the main unit To attach, insert the smart band body into the attachment part from the back. To remove, push the body out from the top. ・Compatible models Xiaomi Smart Band 9 Active Redmi Smart Band 3 ・Color: Black ・Size Length: Approximately 254mm max (including the clasp) Compatible wrist size: Approximately 15-21cm I tried it on, but it didn't fit, so I'm selling it. The price may fluctuate, but I am not accepting price negotiations. Immediate purchase is welcome. Although it is new and unused, please refrain from purchasing if you are sensitive to items stored at home.