Easy Refill Powder, Anyone Can Do Step 1 : Unpacking the bottle powder box Step 2 : Unscrew the cap easily, tear out the isolation film, retighten the cap again Step 3 : Take a cartridge , open the easy refill hole Step 4 : Fit the bottle mouth into the cartridge refill hole , full fill the powder tank. Step 5 : Start with a new amazing printing experience Ensure the high quality printing after refilling Proffisy New Toner Powder, please pour out the Waste Toner Powder from the Waste Bin of the cartridge. Very Important: If forget to pour out the waste toner powder , then it may lead to waste toner full in the waste bin. Then the toner powder will be leaking to the printing pages, and have straight black line defective and effect the printing quality seriously. Compatible Printers: for Brother DCP-L2541 / TN-3145 / for Brother TN3250 / for Brother TN580 / for Brother TN3175 for Brother TN620 / for Brother TN650 / for Brother TN2280 / for Brother TN360 TN450 / TN660 / TN2365 / TN1000 / TN1020 Features High-quality black for everyday printing. Performance and value for your reports, invoices and spreadsheets. Better together. For ultimate speed and quality and maximum printer performance, use Proffisy Toner Powder. With Proffisy toner cartridges and uniquely formulated Proffisy toner powder, get consistent print quality from the first page to the last. The cartridge is designed to produce consistent yields from one cartridge to the next. With Proffisy, get what you expect. NOTE--To our honored customers: Whether you're a home user or business owner,if you are looking for toner cartridge for your printer and do not want to pay the outrageous prices. then PROFFISY is for you to get work done and the quality is sufficient for what you guys need.Giving this set a shot will bring you an amazing experience!!!