HP LaserJet Enterprise M525dn Laser A4 1200 x 1200 DPI 42 ppm

I installed this and turned the printer on and off and it just started working with no trouble. It was in great shape and didn't show many signs of wear. Very pleased.

I added an extra paper tray so that I can use this one for letter size paper. I use tray #2 for legal size paper.

Called HP unit stopped working bought with one year warrentee and HP claims the unit was out of warrentee which is not true as I bought it 8 months ago.

Fit perfectly on my HP LaserJet 400 M401n printer. I just plugged in the new tray, loaded the legal sized paper, made some quick changes in the settings (via the printer's onboard menu system), and everything worked. FYI: Acrobat Reader (for Windows 10) has a setting that makes the printer use the correct size of paper based on the page's size in the PDF file. Meaning that the printer will swap between letter size and legal size paper automatically. Acrobat Reader (for macOS) has the same setting, but it does not work. I googled the issue -- apparently, it's just a Mac thing (problem).

This is great. Don't have to add paper so much. Printer holds alot now.