iMac 20 Inch 4GB RAM, Mac Os X Lion and Windows 7 Professional -

iMac 20inch Mac Os X Lion 4GB Ram 250 GB Harddrive Windows 7 Professional Office 2010 Antivirus with 2 Year Licence General Specs Size and weight 20-inch iMac Height: - 18.5 inches (46.9 cm) Width: - 19.1 inches (48.5 cm) Depth: - 7.4 inches (18.9 cm) Weight: - 20 pounds (9.1 kg) Connections and expansion One FireWire 400 port and one FireWire 800 port; 7 watts each Total of five USB 2.0 ports: three ports on computer, two ports on keyboard Communications Built-in AirPort Extreme Wi-Fi wireless networking2 (based on IEEE 802.11n draft (specification); IEEE 802.11a/b/g compatible Built-in Bluetooth 2.1 + EDR (Enhanced Data Rate) Built-in 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Audio Built-in stereo speakers Internal 24-watt digital amplifier Headphone/optical digital audio output (minijack) Audio line in/optical digital audio input (minijack) Built-in microphone Display Built-in 20-inch (viewable) or 24-inch (viewable) glossy widescreen TFT active-matrix liquid crystal display Resolution 20-inch models: 1680 by 1050 pixels Millions of colors at all resolutions Typical viewing angle 20-inch models: 160° horizontal 160° vertical 24-inch models: 178° horizontal 178° vertical Typical brightness: 290 cd/m2 (20-inch models); 385 cd/m2 (24-inch model) Typical contrast ratio: 800:1 (20-inch models); 750:1 (24-inch model) Processor and memory 2.4GHz, 2.66GHz, 2.8GHz, or 3.06GHz Intel Core 2 Duo processor 6MB shared L2 cache at full processor speed 1066MHz frontside bus 1GB (one 1GB SO-DIMM) or 2GB (two 1GB SO-DIMMs) of 800MHz DDR2 SDRAM; two SO-DIMM slots support up to 4GB Optical drive Slot-loading 8x SuperDrive (DVD±R DL/DVD±RW/CD-RW) Writes DVD+R DL and DVD-R DL discs at up to 4x speed Writes DVD-R and DVD+R discs at up to 8x speed Writes DVD-RW discs at up to 6x speed and DVD+RW discs at up to 8x speed Reads DVDs at up to 8x speed Writes CD-R discs at up to 24x speed Writes CD-RW discs at up to 16x speed Reads CDs at up to 24x speed