Asus P2520LA-XB31 (Intel Core i3-5005U Laptop with Windows 7 Professional 64-Bit optional upgrade to Windows 8.1 Professional) Black ASUSPRO Series offer stunning award-winning design, superb performance and top-rated reliability to power your business. Windows 7 Professional 64-Bit Pre-loaded, optional upgrade to Windows 8.1 Professional Intel Core i3-5005U 2.0 GHz, 4 GB DDR3L SDRAM, 500 GB Hard Drive, 15.6-Inch Screen, Intel HD 5500 LED Back-lit, HD, Matte Screen, ASUS 348mm keyboard with 19mm full size key pitch, integrated Numeric keypad HDD User Password Protection and Security, BIOS Booting User Password Protection, Computrace ready from BIOS 1x USB 2.0, 3x USB 3.0, 1x RJ45 LAN, 1x VGA Port (D-Sub), 1x HDMI 1.4, 802.11ac+Bluetooth 4.0 (Dual band)