The 35 page-per-minute Lexmark T640 is a compact workhorse. The robust monthly duty max is rated at 200,000 impressions. The T640 is equipped with a small keypad as a security feature, useful for entering access pins. A great user-friendly attribute is the front USB slot for easy printing from your USB drive. The genuine Lexmark high-yield toner (64004HA / 64015HA) will output approximately 21,000 pages at 5 percent.