The HP Print Service Plugin is the only print driver that you'll need to easily print documents, emails and pictures from print-supported applications to a variety of HP Printers, including HP OfficeJet, HP LaserJet, HP DesignJet, HP Photosmart, HP DeskJet and HP Envy.

You can discover and print to HP printers that are:
• Connected to the same network as your mobile device
• Broadcasting a Wi-Fi Direct network
• Connected to the mobile device via a USB On-the-Go cable

Just select Print or Share to PSP when you need to print. Just tap the menu button to reveal the print option. Location of menu button may vary depending on your model of Android™ device.

The HP Print Service Plugin simplifies printing on your Android™ Lollipop™ (v5.0) and newer devices. If you use Android 6 (Marshmallow) or earlier, you might need to enable the HP Print Service Plugin in your device's settings

For more information on using the HP Print Service Plugin or details on supported HP Printers, go to:
https://support.hp.com/us-en/document/c04024231/?openCLC=true

For more information on Mobile Printing in general, go to:
https://www.hp.com/go/mobileprinting

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Source: https://play.google.com/store/apps/details?id=com.hp.android.printservice