The genuine HP CH644A maintenance cartridge is designed to keep your HP printer in perfect working condition. Equipped with superb cleaning powers, the HP CH644A maintenance cartridge provides essential printhead cleaning services and removes trapped ink or dirt from your internal printer parts using a delicate extraction process. Ink aerosol left behind after normal printing processes is sucked into the HP 771 maintenance cartridge leaving your printer free to print crisp, clear images. The HPCH644A maintenance tank is also responsible for collecting waste ink ready for safe disposal. Keep you printer running smoothly and invest in the HP 771 maintenance cartridge to avoid costly repairs and downtime.