The AirPort Extreme Card card replaced Apple’s original AirPort card in 2003. The first computers designed to use this card were the iBook G4/800 12-inch (original) and the iMac G4 1.0 17-inch (flat panel).
Apple devices with wireless capabilities after the AirPort Extreme Card had Wi-Fi as a standard feature built in to the architecture beginning in mid-2005. Beginning in 2006 with the Intel-based MacBook Pro, Apple used non-Apple-branded internal wireless cards (e.g., Atheros, Broadcom).
According to Apple’s AirPort Extreme Card User’s Guide:
AirPort Extreme Card Specifications
• Wireless Data Rate: Up to 54 megabits per second (Mbps)
• Range: Up to 150 feet (45 meters) from the base station in typical indoor use
(varies with building)
• Frequency Band: 2.4 gigahertz (GHz)
• Radio Output Power: 15 dBm (nominal)
• Standards: Compliant with 802.11 HR Direct Sequence Spread Spectrum (DSSS)
11 Mbps standard, 802.11 DSSS 1 and 2 Mbps standard, and 802.11g specification