Size and weight

Length: 6.5 inches (165 mm)
Width: 6.5 inches (165 mm)
Height: 1.3 inches (34 mm)
Weight: 1.66 pounds (753 grams)1
Wireless protocols

IEEE 802.11a/b/g/n
Frequency bands

2.4GHz and 5GHz simultaneously
Radio output power

20 dBm (nominal)
Compatibility

Interoperable with Wi-Fi Certified 802.11a, 802.11b, 802.11g, or 802.11n enabled Mac computers, iPad, iPhone, iPod touch, and Windows-based PCs
NAT, DHCP, PPPoE, VPN Passthrough (IPSec, PPTP, and L2TP), DNS Proxy, SNMP, IPv6 (6to4 and manual tunnels)
Included in the box

AirPort Extreme Base Station
Power supply with cord
Printed documentation
Security

Wi-Fi Protected Access™ (WPA/WPA2)2
Wireless security (WEP) configurable for 40-bit and 128-bit encryption
MAC address filtering
NAT firewall
Support for RADIUS authentication
802.1X, PEAP, LEAP, TTLS, TLS, FAST
Time-based access control
Interfaces

One Gigabit Ethernet WAN port for connecting a DSL or cable modem
Three Gigabit Ethernet LAN ports for connecting computers or network devices
USB 2.0 port for connecting a USB printer or USB external hard drive
802.11n wireless