HP Pro 3500 Micro Tower Desktop (3.4 GHz Intel Core i3-3240 Processor, 4GB DDR3, 500GB HDD, Windows 7 Professional) Manufacture Warranty: 12 months parts; 12 months labor // Universal USB Wired W8 Keyboar US // HP USB Optical Mouse ECO // 6 x USB 2.0, 1 VGA, 1 DVI, RJ45, 1 x 5.25" external bay, 1 x 3.5" internal bay, 1 PCIe x16, 3 PCIe x1, 1 mini PCIe DVDRW; lets you access or burn several disc formats including CDs and DVDs // Intel HD Graphics 2500 3rd generation Intel Core i3-3240 3.4GHz Dual Core Processor; delivers excellent computing performance // 4GB of DDR3 memory; enhances the efficiency of your system Windows 7 Pro 64-bit installed 500GB 7,200RPM Hard Drive; provides ample space for your data // Wireless LAN 802.11 b/g/n; for a smooth web connection