33.6Kbps Laser Fax Machine generates super-fast and efficient document transmissions (up to 4 seconds per page). Built-in Junk Fax Prohibitor feature helps prevent unwanted faxes from being received and wasting valuable toner and paper. The built-in ADF on the KX-FL421 allows the machine to be used as a desktop copier so it's great for home office users who need to make an occasional copy. The KX-FL421 has a rated print speed of up to 10 letter-size copies per minute with 600 x 600 dpi. It is Caller ID compatible so you can see who's calling before answering. The 2-line-by-16-character LCD shows the name and number of your incoming callers. You can even display and print a list of Caller ID activity. Compact design also includes a built-in handset, 100 speed dial stations, 250-sheet paper tray and 150-page document memory.