i bought one for 25 and it did not work right. paid and sent it back. they kept it 2-3 months and returned in same condition. in the meantime i purchased a 15 dollar one and it would not stay on either. new batteries. i would not buy another one. i bought an acer and the on/off switch is great. i suggest this or a microsoft mouse. they do not fix anything so don't bother User's recommendation: buy an acer or microsoft mouse at the beginning.