This is a new Logitech MK850 Performance Wireless Keyboard & Mouse Combo, in OEM box. Box has been opened and both items have been used once or twice as demos but that’s it. Both pair up to 3 devices at once via 2.4 GHz Bluetooth. Both have Logitech FLOW, which allows for seamless navigation between multiple computers. Keyboard features: cushioned palm rest, curved keyframe,& numeric keypad. Mouse features: 8 buttons, optical movement, contoured design