Size and weightHeight: 0.95 inch (2.41 cm) Width: 12.78 inches (32.5 cm) Depth: 8.94 inches (22.7 cm) Weight: 4.5 pounds (2.04 kg)1 Connections and expansionMagSafe power port Gigabit Ethernet port Two USB 2.0 ports (up to 480 Mbps) Mini DisplayPort Audio line in Audio line out Kensington lock slot CommunicationsBuilt-in AirPort Extreme Wi-Fi wireless networking2 (based on IEEE 802.11n draft speci