The rear fingerprint sensor is now positioned centrally under the camera.
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Formerly the popular Obihai OBi200. (Polycom bought Obihai in 2018.)
Works with both Android and iOS devices.
Shell Shocker! Today only. Newegg with Amazfit North Amwerica has the AMAZFIT Bip Lite Smart Watch with Heart Rate Monitor (black) for $40 with free shipping. Features up to 45-days of battery life and 3 ATM water resistant.