Aspire Z1-621-UR22 Touch AIO Desktop. Integrated 21.5" 10-point touchscreen Maximum Resolution: 1920 x 1080 Aspect Ratio: 16:9 Brightness (typical): 250 cd/m2 Audio: Integrated microphone and two speakers OS: Windows 8.1 (64-bit) Processor: Intel Pentium Processor N3530 (2MB cache 2.16GHz up to 2.58GHz burst frequency) Memory: 4GB (4) DDR3 SDRAM Storage: 500GB SATA hard drive 5400RPM; SD card reader