Accurate color, precise image reproduction and crisp, sharp text every time you print. Chemically-grown toner and HP Smart printing system technology[1] deliver consistent results and reliable performance throughout the life of the cartridge.

Consistently accurate color and precise images with HP chemically-grown toner

Optimal print quality with new image mode feature[3]

Save time with all-in-one HP 645A LaserJet supplies. HP Smart technology[1] makes automatic adjustments to optimize print quality and enhance reliability. Minimal user intervention saves time, improves productivity and lowers overall printing costs.

Cost-effective, reliable operation comes with HP Color LaserJet printing supplies. HP 645A LaserJet Toner Cartridges are designed together with the printer to provide reliable operation. The all-in-one supplies design provides time-saving operation with fewer supplies to order and maintain. For further time savings, HP toner formulas are engineered to support in-line printing and fast fusing at lower temperatures for fast warm-up time and a quick first page out.

Smart printing technology[1] in HP LaserJet toner cartridges and your printer monitors the environment, sensing temperature and humidity (available with HP Color LaserJet 5550 only).To ensure consistent print quality, the system makes continuous, automatic adjustments to particle charge.These dynamic electrophotographic adjustments optimize color density, calibration and consistency to produce high quality results over the life of the cartridge.

Rated A+ for service and reliability, PC Magazine August 2003