User Guide for Xiaomi Mi Band 4 with essential tips and tricks. The Xiaomi Mi Band 4 is a wearable activity tracker produced by Xiaomi Inc. Which is allow you to track your health, instantly view call, text, app notifications and music in play. DISCLAIMER This is an UNOFFICIAL guide and is not affiliated with the Xiaomi Inc. This guide is for educational and reference purposes only. If you have a concern or feel there is a direct copyright or trademark violation that does not fall within "fair