Finally, Bluetooth’s main strength is its ability to simultaneously handle both data and voice transmissions. It is capable of supporting one asynchronous data channel and up to three synchronous voice channels, or one channel supporting both voice and data. This capability combined with ad hoc device connection and automatic service discovery make it a superior solution for mobile devices and Internet applications. This combination allows such innovative solutions as a mobile hands-free headset for voice calls, print to fax capability, and automatically synchronizing PDA, laptop, and cell phone address book applications (Fig. 1).