Colour scan Colour scanning Laser technology Laser HP SS321A, Laser, Mono printing, 1200 x 1200 DPI, Color scanning, A4, Direct printing HP SS321A. Print technology: Laser, Printing: Mono printing, Maximum resolution: 1200 x 1200 DPI. Scanning: Color scanning, Optical scanning resolution: 1200 x 1200 DPI. Maximum ISO A-series paper size: A4. Wi-Fi. Direct printing