Apple's AirPort Extreme wireless networking products lets you surf the Internet from almost anywhere in your home or business, and enables schools to provide Internet access to multiple students without installing expensive cabling. With AirPort Extreme-enabled Macintosh systems, it's a snap to exchange files or play multiplayer games at data transfer rates of up to 54 megabits per second. And because AirPort Extreme uses radio waves for communication, it can even work through walls. Even with its increased performance AirPort Extreme is compatible with the industry-standard 802.11b wireless networking protocol, which means all AirPort products, as well as Wi-Fi certified 802.11b wireless products, will work with AirPort Extreme. For higher performance you need to have both the Airport Extreme Card and the AirPort Extreme base Station. The range of AirPort Extreme is up to 50 feet at 54 Mbps and up to 150 feet at 11 Mbps. Since AirPort antennas are built into all new computers from Apple, all you need to add is an internal AirPort Extreme Card for each AirPort Extreme-ready system you want to bring onto a wireless network. This will allow you to join any of the thousands of Wi-Fi certified 802.11b wireless hot spots that are currently running in coffeehouse, bookstores, airports, and even some restaurants. If you want to create your own wireless network in your home or business just add an AirPort Extreme Base Station to communicate between your AirPort and AirPort Extreme-ready systems and the Internet, without wires. The AirPort Extreme Card can be installed only in computers that are AirPort Extreme ready. AirPort Extreme Cards cannot be used in AirPort ready computers with an AirPort Card slot.