for: ml-1640/2240 series the twin pack of genuine samsung black toner cartridgees (1,500 pages per cartridgee) was developed for use in your samsung printer to deliver quality print results. you get top performance, 100% reliability and impressive quality every time you print. specially optimized for unrivaled quality. samsung high-yield original toner cartridge provides sharp details and vivid colors. even small text is sharp and easy to read. trust only original samsung toner cartridgees always use genuine samsung toners to avoid damage to the printer and other problems. black laser printing technology yield (combined) per cartridgee: 1,500 pages in black and white annotation on page yield the yield value shown is iso/iec 19752. the operating environment, print interval, graphics, media type, and media size may affect the actual number of pages. operational requirements operating temperature range 10 to 30 ? c operating temperature range 50-86 ? f storage temperature range -20 to 40 ? c storage temperature range -4 to 104 ? f storage humidity 10 to 90% rh