Dell Inspiron 15 i5547 Microsoft Signature Edition Laptop / i5-4210U / 8GB memory / 1TB HDD / No optical drive / Backlit keyboard / HD webcam / Bluetooth 4.0 / Windows 8.1 64-bit / Silver Intel Core i5-4210U 1.70 GHz with Turbo Boost Technology up to 2.70 GHz 15.6 in LED-backlit with Truelife (1366 x 768); Intel HD Graphics 4400 with shared graphics memory 8GB DDR3L 1600 MHz; 1TB 5400 RPM HDD; Windows 8.1, 64-bit No optical drive; Backlit keyboard; Bluetooth 4.0; 720p webcam 2 USB 3.0  1 USB 2.0  HDMI  Headphone output/Microphone input combo  LAN (10/100); 802.11ac/a/b/g/n (Miracast enabled)