Cell phones and digital organizers must have Bluetooth capability built into the device. All have some sort of antenna. Depends on device. Up to 1 Mbps. A built-in security system authenticates that information is coming from expected sources.
Information is encrypted before being sent.
Will coexist with other networks but cannot be integrated. The Wireless Ethernet Compatibility Alliance started promoting the standard in Sept. 1999. Aims to be the ultimate local network for use at home, work, in hotels and at the airport. At 300 feet, Wi-Fi's range is more extensive than the competition so it targets office users in networks of up to 100 PCs. But the alliance is also pushing the wireless network to home users who tend to share massive movie files, play video games between PCs and experiment with multimedia.