YOUTHINK Bluetooth Barcode Scanner User Manual page 7

After you do this set-up then your scanner disconnect the BT host.
Shut down (turn off the scanner)
Connect the last host
This setting is for your needs, if you want pair with the last host (make
sure the last BT host be opened)
(3)iOS Keyboard show/hide Settings
Double click the button quickly to show/hide the iOS keyboard,
Notes:
when you have no manual book.
(4)Battery Status
Scan the barcode directly, show the battery status percent on your PC