HP Probook 640 G1 Review - The Perfect Laptop for students? - YouTube
HP ProBook 640 G1 14" 1366x768 - i5-4200M 2.50 GHz Processor, 8GB RAM, 128SSD, Windows 10, Grade B+ - Green Dragon Technology
HP ProBook 640 G1 14” Core i5, 2.5GHz, 8GB RAM 256GB SSD Win10 Home (Refurbished) | StackSocial
Amazon.com: HP ProBook 640 G1 14in HD Anti-Glare Notebook Laptop, Intel Core I5-4200M Up to 3.1GHz, 8GB RAM, 500GB HDD, Windows 10 Professional (Renewed) : Electronics