Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances (using short-wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Y HDMI 1 HP ProBook 4515s, 2.2 GHz, 15.6", 1366 x 768 pixels, 4 GB, 500 GB, Linux HP ProBook 4515s. Processor model: M500, Processor frequency: 2.2 GHz. Display diagonal: 15.6", Display resolution: 1366 x 768 pixels. Internal memory: 4 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 500 GB. Discrete graphics card model: AMD Mobilty Radeon HD 4330. Operating system installed: Linux. Weight: 5.71 lbs (2.59 kg) http://www.techradar.com/reviews/pc-mac/laptops-portable-pcs/laptops-and-netbooks/hp-4515s-620700/review The HP ProBook 4515s (£369 inc. VAT) strikes an effective balance between power and mobility and proves a success despite minor flaws. While the 2.5kg chassis quite wide, the use of lightweight plastic means it isnt very heavy. If the size doesnt put... Some great extra features, Good graphics power, Excellent battery life Sub-par processor performance, Build could be better