Panasonic KX-P7305 - Manual (Page 120)

Setting the PS Printer Driver (Mac OS X 10.1 - Mac OS X 10.2)
Macintosh Macintosh Windows Basics 115
12
Click Printer Features menu and select Duplex menu.
13
Click on the Print on Both Sides check box and click your desired
binding style icon.
14
Click [Print].
The document will be automatically printed on both sides of pages.