Bluetooth wireless technology has an authentication function, which ensures you are communicating with the right person.With the authentication function, you can prevent any anonymous Bluetooth device from accessing your notebook, PDA or mobile phone.
The first time any two Bluetooth devices communicate, a common Passkey should be determined for both devices to be registered. Once a device is registered, there is no need to re-enter the Passkey.You can change your settings in order not to be discovered by other Bluetooth devices or you can set a limit.