- The HP ProBook 6550b is a budget-friendly, silver and black, 15.6-inch laptop. It features an anti-glare, LED backlit display with a screen resolution of 1366×768 pixels. This ENERGY STAR-qualified HP ProBook notebook is equipped with the Windows 7, 64-bit, Professional operating system and powered by a 2.53 GHz Intel Core i5 processor. A maximum of 8 GB of RAM is supported by this model, and the device can be upgraded if needed, and the buyer can access additional data via the integrated DVD Super Multi drive, three USB ports, or a multi-in-one media card reader. The HP ProBook notebook also features a 2.0 MP webcam, an Ethernet connection, and the 802.11 a/b/g/n Wi-Fi technology. The wireless runtime for this HP ProBook notebook is estimated to be about 6.5 hours via a 9-cell Li-ion battery. This laptop, product number WZ303UT#ABA, weighs 5.5 lbs and measures 14.6 inches wide by 9.8 inches high by 1.4 inches thick.