Open the iTouch's GUI Settings - > Bluetooth > turn on Bluetooth switch,to search for all nearby Bluetooth devices within 10 meters,Connect the Bluetooth device with the name of "OSCall". Enter the Bluetooth password (default password: 1234). The connection succeeds.
Note: to be safe, it suggest to change PIN code and OSCall device's name. Each Battery compartment of OSCall device affixed with its own Bluetooth address, if unable to confirm the device, you can find the Bluetooth address