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 DisplayPort 1 HP ProBook 6555b, AMD Turion II Dual Core, 2,3 GHz, 39,6 cm (15.6"), 1366 x 768 pixels, 2 GB, 250 GB HP ProBook 6555b. Processor family: AMD Turion II Dual Core, Processor model: P520, Processor frequency: 2,3 GHz. Display diagonal: 39,6 cm (15.6"), Display resolution: 1366 x 768 pixels. Internal memory: 2 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 250 GB, Optical drive type: DVD Super Multi DL. Discrete graphics card model: AMD Mobility Radeon HD 4250. Operating system installed: Windows 7 Professional. Product colour: Silver. Weight: 2,51 kg