These are new in the box. This keyboard and mouse combo is far better quality than any set you will find in a retail store. Dell's equipment is built for the office environment. It is built to last. Save you 40% at Discount Electronics. These kits will include the mouse, keyboard, dongle, and battery. Dell sells the same set for $49.
The Dell Wireless Keyboard and Mouse Combo KM636 are 2.4ghz, not Bluetooth. That means it is driver/software free and works instantly with every PC or mack ever made (that has USB) regardless of the operating system.