I have baught this dell wireless mouse 6-7 month ago.An I am totaly unsatified with the product.I didnot knew that dell can fool us in this ways.it is better to buy an local wireless mouse then buying it.the main problam with this mouse is the enery consumption.it can run maximum 3 hour with on cell.and I have waste more then 500 ra till date on cells because of this mouse.and the worst thing is that it drains the battry in off mode also.