HP MFP M428fdn LaserJet Pro Printer

Print speed black:
Normal: Up to 38 ppm 1 
First page out (ready)
Black: As fast as 6.3 sec 2 
Duty cycle (monthly, A4)
Up to 80,000 pages 3
Print technology
Laser
Print quality black (best)
Fine Lines (1200 x 1200 dpi)
Mobile printing capability
HP Smart App
Apple AirPrint™
Google Cloud Print™
HP ePrint
Mobile Apps
Mopria™ Certified
Roam capable for easy printing 8
Memory
512 MB
Maximum memory
512 MB
Duplex printing
Automatic (default)
Scanner type
Flatbed, ADF
Scan file format
PDF, JPG, TIFF
Scan resolution, optical
Up to 1200 x 1200 dpi
Duplex ADF scanning
Yes
Copy speed (normal)
Black: Up to 38 cpm
Faxing
Yes
Fax transmission speed
33.6 kbps 7 
Fax memory
Up to 400 pages
Fax Resolution Black (best)
Up to 300 x 300 dpi (halftone enabled)
Fax Speed Dials, Maximum Number
Up to 120 numbers