compatible with clx-8640nd/8650nd . samsung original 20,000-page black toner cartridgees have been developed for use in your samsung printer and deliver quality print results. you get top performance, 100% reliability and impressive quality every time you print. specially optimized for unrivaled quality samsung original toner prints prints with sharp detail and vivid colors. even tiny printed 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 (black &, white) 20,000 pages annotation on page yield the yield value shown is iso/iec 19798. the operating environment, print interval, graphics, media type, and media size can 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