Microsoft Wireless Optical Dekstop for Bluetooth. IMO, the best keyboard and mouse I have ever used. It is wireless, has great battery life (I have been putting it through its paces for the past 2 weeks), and great feel. The keys have a nice travel, and fell good when pressed, no clickety clank noise. The mouse is ergonomically the same as the Wireless Intellimouse Explorer, but this one has bluetooth. Both the keyboard and mouse are on a secure bluetooth connection, and the paint job on them is done by the same people who do BMW cars. I have taken the keyboard/mouse into another room in my house, through a wall, and verified that they still worked. I was bout 20-30 feet away, with about a half of a foot, to a foot of wall inbetween the devides and the tranceiver. If you got money to burn, and want, IMO, the best keyboard and mouse, get these. They retail for 159, but got it at CompUSA for 149 (I know, great savings 😛). I would recommend this keyboard/mouse for anyone that is in the market for a wireless system, and want the security, and the range of bluetooth. Also, the mouse has never skipped on me, where the Wireless Intellimouse Explorer has. Tne new sensor on this mouse can track 9000 fps. I play fast action games, and the mouse hasn't stuttered in them. Hope this helps, and good luck with your search.