You're right, it's an incorrect illustration. Thank you for pointing this out. I have passed this on to the relevant department for correction and it will be dealt with as soon as possible.
The HP LaserJet 550 Sheet Feeder (CF404A) is compatible with the HP LaserJet Pro MFP M477 and other specific models in the Color LaserJet Pro series, but it is not explicitly listed for the HP LaserJet Pro MFP 4102dw. It is advisable to check compatibility directly with HP or in the printer's user manual to ensure it will work with your specific model.
Description
Expand the paper capacity of your HP Color LaserJet series laser printer or multifunction device by up to 550 sheets with this original add-on tray. Suitable for M452 & M477
Ciao,
i have on my HP M477fdn the 1st tray for manual feed (single sheet) and the 2nd tray with 250 sheets for e.g. 90gr. paper. (both trays are standard in the device) - I was able to install the 3rd optional tray without any problems and use it for 80gr. paper for 550 sheets - and RTFM (read the fxxx manual) in the operating manual (page 12) there is nothing described about a 4th tray. Conclusion: from my point of view max. 3 trays are possible so only one optional module for 500 sheets - otherwise I would contact hp switzerland directly to clear all doubts.