HP (Hewlett Packard) LaserJet 5si nx (C3950A) is a monochrome (black and white), workgroup printer. It has a print resolution of 600 x 600 dpi which makes each print clearer and sharper. It has a print speed of 24 pages per minute. The HP LaserJet 5si nx has a 1,100 sheets total input capacity, It includes 1 x 100 sheets, 1 x 500 sheets and 1 x 500 sheets. It has a maximum input of 3100 sheets. It's media types are transparencies, envelopes, labels and plain paper. It's media sizes are A3, Letter A Size, B4, A4, Legal, Ledger B Size, Executive, B5. It has a monthly duty cycle of 10,000 sheets. It also features 4 MB RAM and parallel connectivity. The HP LaserJet 5si nx comes with a 1 year manufacturer warranty. HP LaserJet 5si nx uses 09A and 09X black cartridge. Cartridge model numbers are C3909A and C3909X.