Carrot's compatible ink cartridges and supplies for HP Deskjet 840C are designed to offer the best print performance, dependability and consistent yields that meet or surpass HP OEM (Original Equipment Manufacturer) specifications for the HP Deskjet 840C and offer high-quality output. These compatible ink cartridges are brand new and are a smart alternative to high-cost OEM HP ink cartridges and supplies, offering substantial savings over the brand-name inkjet cartridges and supplies. Using compatible replacementink cartridges and supplies for your HP Deskjet 840C will not void your printer warranty. Carrot Ink guarantees 100% satisfaction on quality Deskjet 840C ink cartridges and printing supplies.