This is a great mouse! Works perfectly on nexus 7 which runs on android OS and I have no issues with the mouse when using on dell venue 8 pro which runs on windows 8.1 OS. The mouse build is really good considering the price that it costs. Buttons do not move around like in some other mouses at this price range. The ergonomics of this mouse is also a great thing, it just fits in your hand like a glove plus the rubber sides feel great when using the mouse, though i do not like the top of the mouse which is glossy, would like it if it was mat plastic. Other great thing is the battery consumption. The mouse goes to sleep when not used for some time and wakes up after when you start using it, that way it saves a ton of battery energy, i bought this mouse in May put a Duracell battery and i am still using the same battery. Great buy!