CS421 developer units can work for Lexmark printers as below:
For Lexmark C2240 C2325 C2325dw C2425dw C2535 C2535dw C2640 CS521dn CS421dn CS521 CX421adn CX522ade CS622de CX622ade CX625 MC2325adw MC2425 MC2425adw MC2535 MC2535adwe MC2640adwe XC2235 XC2240 XC4240 Printers.

Product Description:
※ 78C0D10 black, 78C0D20 cyan, 78C0D40 yellow, 78C0D30 magenta replacement developer Unit.
※ A single developer unit weighs 1kg, and the volume is 33cm * 12cm * 13cm.
※ 78C0D10 black developer unit is 12,500 pages, 78C0D20 cyan developer unit capacity is 12,500 pages.
※ 78C0D30 magenta developer unit is 12,500 pages, 78C0D40 yellow developer unit capacity is 12,500 pages.

Package Contents:
☑ 78C0D10 black developer unit x1.
☑ 78C0D20 cyan developer unit x1.
☑ 78C0D30 magenta developer unit x1.
☑ 78C0D40 yellow developer unit x1.

Printing experience:
- Delivers exceptional print quality for all your printing needs.
- Easy to load and install, ensuring a hassle-free printing experience.
- Print crisp text with premium quality developer unit.
- Intelligent Chip Sensors guarantee compatibility with a wide range of printers, both new and old.

Warm Tips:
☛ Please confirm your developer unit model and printer model with us before placing an order to ensure compatibility. (Different regions may have variations in developer unit models)
☛ Make sure not to touch the chip sensor on the Developer Unit for optimal performance.