Overview HP 311 Laser Jet Printing Supplies work with the printer to make high-quality colour printing easy, cost-effective & reliable. An enhanced electro-photographic process achieves a broad range of vibrant colours & sharp text on a variety of papers. Features HP 311 Laser Jet Printing Supplies & the printer use an enhanced electro-photographic process to maintain accurate colour even in extreme conditions. Advanced toner formulas deliver a range of vibrant colours & sharp text. HP 311 Laser Jet Printing Supplies are easy to install & maintain. HP Smart Printing Technology[1] in HP print cartridges & your printer notifies you when to replace a print cartridge & tells you exactly which part you need. HP 311 Laser Jet Printing Supplies with Smart Printing Technology[1] make automatic adjustments to optimise print quality & enhance reliability. Minimal user intervention saves your valuable time & improves productivity.