Xiaomi Mi Band 2 review: A super low-cost heart rate fitness band, but it's got its limits - CNET
Amazon.com: 4 Pack Bands for Xiaomi Mi Band 4 & Mi Band 3 Strap, Soft Silicone Air-Hole Replacement Wristbands for Xiaomi Mi Band 4 & Mi Band 3 Fitness Tracker (Black Red+Blue