ACER Aspire Pentium ES1-512-P7TZ comes with Windows 8.1, 64-bit Operating System, Intel Pentium N3540 Quad-core 1.80 GHz (4 Core) Processor, Led Backlit 1366 x 768 Pixels 15.6" LCD Display, 500 GB Hard Drive, 4 GB DD3L SD RAM, ADM Radeon R4 Graphics, DDR3L HD RAM, Shared, ACER Aspire Pentium ES1-512-P7TZ also has Integrated stereo speakers, Webcam, Microphone, 3-cell Lithium Polymer 3220 mAh Bettry, Power adapte, USB 3.0 x 1 No of USB 2.0 x 2, HDMI x 1, VGA x 1 by Acer.