I recommend spending a little more for a well-known brand. Like many things made in China, they look good but have serious quality issues. I had them for a few weeks and they used them very easily. However, one of the two mice had horrible background noise from the start (much worse than my iPhone6+'s built-in microphone), making me sound like I was in a tin can. The second showed very good quality after about half a dozen uses and then stopped working at all. It's slowly dawning on me that this cheap Chinese junk is just a harbinger of buying quality goods and is therefore a waste of money. I must say that I am not against imported goods and many countries (including our neighbors in North America) produce quality goods. However, Chinese manufacturers seem to be producing only discarded junk.