HP 644 LaserJet Printing Supplies with HP ColorSphere Toner deliver sharp black and brilliant colour every time you print. Improved gloss enables a dynamic range of bright, brilliant and more intense colour. Quick, easy, more productive. HP ColorSphere toner enables fast, high-quality printing. HP Smart technology in HP supplies interacts with the printer to consolidate needed supplies into a single order. You choose the reseller and order online. HP 644 LaserJet Printing Supplies with HP Smart printing technology enable the cartridges and the printer to make adjustments that optimise print quality and reliability - and provide a lower overall cost of printing.