i love my mouse! it's really easy to transport, the battery life is insane! it's light weight and really responsive compared to all the other mice I've used. i'm unable to use a regular mouse now, i got to bring this around with me. the four way scrolling wheel makes stuff so much easier.. also the programmable buttons rock... i use it hours every day and the battery lasts many months
edit: btw, it's a Microsoft Laser Notebook Mouse 6000
laser
bluetooth
4 way scrolling
programmable buttons
single AA battery, lasts a lifetime
best mouse that will ever be made ever