I am now using this microsoft wireless mouse and it is a very good product.my mouse’s model number is 4000. it shows no problem of connection with the computer. it uses bluetrack technology and can be used upto a maximum range of 15feets.
It is a very reliable and mobile product, can carry it any where easily. the trans receiver of the mouse is very small usb and can be kept connected with the laptop while packing. I recommend this mouse to every one