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The Microsoft wireless mouse 4000 is quite an old model, although it still is available and would be the one I'd go for over others, having had two other Microsoft wireless mice and found this model to be the best of the three.
The 4000 is a wireless mouse that's about 4 inches in length and about 2 inches in width. It connects to the laptop or computer via a dongle that plugs into one of the USB ports. The dongle itself is about 2 inches long and when not in use, it clicks into a space on the underside of the mouse. The dongle is very secure under there. My mouse is carried around in a laptop bag when it's not in use and it's never popped out of its holder once.
Performance-wise it's a good sturdy mouse. When the dongle's plugged in, the signal is good, although it's usually best to plug it into a USB port on the right of your computer if you're right-handed and on the left if you're left-handed. If you do this the opposite way, it sometimes forces an error, saying that the mouse signal quality is low. I find that this occurs more often when the battery power is low.
The battery life itself is good. It takes standard AA batteries and it accepts rechargeable ones as well as normal ones. The normal ones tend to last for about six months, if you use the mouse for about three hours a day. It can be quite difficult to get the battery cover off though, especially if you have long nails that you love and don't want to ruin!
The buttons are large and run almost all the way from the front of the mouse to the back and they click smoothly. The wheel in the centre is made of a soft rubber material and also moves smoothly, although it wasn't quite as smooth when this mouse was first purchased. It takes a bit for the wheel to 'bed in'.
Once the dongle is plugged into the computer, it works fine (shown by a green light on the end of it) but it is quite sensitive and if knocked in just the slightest, the light flashes and the mouse won't work for about ten seconds. The mouse itself is quite small so it might not be the best fit for those with larger hands.
In all, this mouse is great if you require wireless connectivity from your mouse to your laptop or PC and this is the best wireless mouse I've found so far. I paid over £30 for it when I bought it from PCWorld, but if you shop around there are probably going to be better prices out there, as this isn't the most recent wireless mouse that Microsoft have brought out.