TN-3185 Up to 7,000 pages @ 5% A4. When you see the Toner Low error message, the toner cartridge is almost empty. You should order a new toner at this time to be ready for when the toner cartridge is out of toner. Contact your Brother reseller for ordering information.The toner is rated when printing on single sided A4/Letter sized paper at 5% page coverage and with the print density level set to 0. For best performance, use only genuine Brother supplies.