HP LaserJet Pro 400 Printer M401 series - Manual (Page 88)

Store and recycle supplies
Recycle supplies
To recycle a genuine HP toner cartridge, place the used cartridge in the box in which the new cartridge
arrived. Use the enclosed return label to send the used supply to HP for recycling. For complete
information, see the recycling guide that is included with each new HP supply item.
Toner cartridge storage
Do not remove the toner cartridge from its package until you are ready to use it.
CAUTION: To prevent damage to the toner cartridge, do not expose it to light for more than a few
minutes.
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