Belt unit yields approximately 50,000 pages. Approximately 50,000 pages based on 2 pages per job and 60,000 pages based on 3 pages per job (letter/A4 single-sided pages). The number of pages may be affected due to a variety of factors including but not limited to media type and media size. Use the Brother Genuine BU229CL with the Brother HL-L3220CDW, HL-L3280CDW, HL-L3295CDW, HL-L3300CDW, HL-L8245CDW, MFC-L3720CDW, MFC-L3765CDW, MFC-L3780CDW, and MFC-L8395CDW.