Scanner Canon CanoScan LiDE 400 Flatbed Scanner, A4 Scanning element: CIS Light source: 3-color (RGB) LED Optical resolution: 4800 x 4800dpi Selectable resolution: 25 - 19200dpi Interface: USB-Type C (USB 3.0 and 2.0 compatible) Scanning gradation (colour): 48 bit input -> 48/24 bit output Scanning gradation (greyscale): 16 bit input -> 8 bit output Maximum Document Size: A4 / Letter (216 x 297mm) EZ-Scan Buttons: 5 buttons (PDF x 2, AUTOSCAN, COPY, SEND) Scanning speed: (colour) (Reflective) 25.4msec/line (4800 dpi) 14.8msec/line (2400 dpi) 6.6msec/line (1200 dpi) 3.8msec/line (600 dpi) 1.7msec/line (300 dpi) (greyscale, B&W) (Reflective） 8.2msec/line (4800 dpi) 4.3msec/line (2400 dpi) 2.2msec/line (1200 dpi) 1.3msec/line (600 dpi)