If this feature is enabled on the Xiaomi smartphone, the device will unlock as soon as it is near the Bluetooth device, and the Xiaomi will remain unlocked until the Bluetooth connection is disconnected.

Note: Currently, the Xiaomi smartphone only supports in-house Bluetooth devices, such as a Mi Band Smartwatch.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Passwords & security
Step 3:  Tap on  Unlock with Bluetooth device
Step 4:  Enable  Unlock device
Step 5:  Enter the current  pattern,   PIN  or  password  and follow the instructions on screen
  1. Open the Settings
  2. Tap on Passwords & security
  3. Tap on Unlock with Bluetooth device
  4. Enable Unlock device
  5. Enter the current pattern, PIN or password and follow the instructions on screen

Xiaomi Instructions
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