Lenovo Group Limited is one of the largest manufacturers of personal computers in the world. Formed by the acquisition of IBM Personal Computing Division, the company develops, creates and markets desktops, workstations, servers and monitors. It offers the ThinkPad notebook under the ThinkCentre, ThinkStation and IdeaPad sub-brands. Lenovo Group Limited operates various research and development centers in China, Japan and the United States. It provides maintenance and support, personal computer disposal and recycling and deployment services to large enterprise and medium business, homes, home offices, and government and education sectors. The company also offers a range of computer-related accessories and upgrades that include audio and video equipment, batteries, cables, power adapters, carrying cases, docks and port replicators, memory devices and monitors. It additionally provides printers, projectors, security equipment, software and storage solutions, video cards, and wireless and networking solutions.