This mouse relies on a short insert that fits into a USB port, It is very vulnerable to damage if you move your laptop or heaven forbid use it as a LAPTOP. (i.e. on your lap.) I puchased my mouse on July 7, 2005 and it went bye bye on Sept 17th 2005. I am really angry about the fragility of the adapter. I had to buy batteries 4 times during that short period. It is a great mouse that needs better engineering. Think twice before spending $37.00 for 2 months use.