Compatible Brother TN 233/237/TN233/TN237
1x TN-237 Black           3,000 Pages
1x TN-237 Cyan           2,300 Pages
1x TN-237 Megenta     2,300 Pages
1x TN-237 Yellow         2,300 Pages
Using printer: HL-L3210CW, DCP-L3551CDW, MFC-L3710CW, L3770CDW
*Those chips have battery, if you cannot finish them in 6 months, may be the battery will run out, then the printer cannot recognize them.