Two-sided printing; 100-sheet ADF; Energy Efficient Print, copy, scan, fax Print speed up to 38 ppm (black) and 38 ppm (colour) HP ImageREt 3600 Ideal for 5-15 people printing up to 10,000 pages per month who want premium colour at fast speeds plus quick scanning and copying into workflows.Dynamic security enabled printer Certain HP printers are intended to work only with cartridges that have a new or reused HP chip or electronic circuitry. These printers use dynamic security measures to block cartridges using a non-HP chip or electronic circuitry. Periodic firmware updates will maintain the effectiveness of these measures and block cartridges that previously worked. Reused HP chips and electronic circuitry enable the use of reused, remanufactured, and refilled cartridges. Printing Secure printing Yes Watermark printing Yes N-in-1 print function Yes Time to first page (colour, normal) 7.9 s Warm-up time 200 s Print speed (colour, normal quality, A4/US Letter) 38 ppm Print speed (black,