The Mi Band 3 offers a heart rate sensor, NFC, and a 0.78-inch OLED screen, all for $30.
Source: Xiaomi Mi Band 3 picks up an upgraded OLED panel and NFC, costs just $30
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it Warning: Use this procedure at your own risk and responsibility. GizChina.it and GizBlog.it are not responsible for bricked devices and any other problem that may occur. Your warranty will be void if you tamper with any part of your device / software. Source: Guide to convert Amazfit Cor in English | Translated Firmware