Hewlett-Packard Company aka HP is an American multinational information technology corporation offers a number of laptops, pc desktops, printers, accessories with different capacities and specifications.

Dell Inc. is an American privately owned multinational computer technology company, that develops, sells, 
repairs and supports computers and related products and services.
Dell computers provide high range of laptops and desktops.

Lenovo ThinkPad is a line of business oriented laptop computers known for their boxy black design. ThinkPads were originally an IBM product; they have been manufactured and sold by Lenovo since early 2005, following its acquisition of IBM’s personal computer division.

Logitech International is a Swiss provider of personal computer and mobile peripherals.
Logitech designs products that have an everyday place in people’s lives from music, gaming, video, smart home, communication and computing.