content: i ordered this item in December. I noticed that when I received it that the mouse actually is the 5000 instead of the 4000. No big deal I thought. I've later realized the the keyboard is the Wireless Comfort Keyboard 4000. I can't imagine that these were meant to be sold together.The mouse doesn't seem to work with some online games.I hate that the keyboard has no lights to show when the Cap Lock and Num Lock are on or off.