HP LaserJet Pro 400 Printer M401 series - Manual (Page 43)

Automatically print on both sides with Windows
NOTE: This section applies to the HP LaserJet Pro 400 M401d Printer, HP LaserJet Pro 400 M401dn
Printer, and HP LaserJet Pro 400 M401dw Printer models only.
1. On the File menu in the software program,
click Print.
2. Select the product, and then click the
Properties or Preferences button.
ENWW Print tasks for Windows 31