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HP 311 LaserJet Printing Supplies and the printer use an improved electro-photographic process to maintain accurate colour even in extreme conditions. Advanced toner formulas deliver a range of vibrant colours and sharp text. HP 311 LaserJet Printing Supplies are easy to install and maintain. HP Smart Printing Technology in HP print cartridges and your printer notifies you when to replace a print cartridge and tells you exactly which part you need. HP 311 LaserJet Printing Supplies with Smart Printing Technology make automatic adjustments to optimise print quality and enhance reliability. Minimal user intervention saves time and improves productivity.