Datalogic ELF User Manual page 86

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You can also select Encrypt or Authenticate from the Bluetooth® control panel to
apply or modify those settings.
1. To require Authentication, check the checkbox, then tap OK.
2. If required, the Authentication Request dialog will then open, requesting that you
enter a PIN. Use the Input Panel or the keyboard to type the PIN.
3. Tap OK to complete.
The dialog will also appear when an Authentication request is received from another
device.
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1 ELF™