Avoid this mouse even for casual use it is completed unfit for purpose. Also sind es die MID A. They have been kept at my office since I unboxed them and have never been exposed to sweat or water. The mouse is Huge! Well see about longevity but Im happy so far. They do a terrible job of isolating ambient sound around the room. It?s not expensive, perfect fit good material. I personally don?t like this setting but appreciate that it will be useful for many buyers. I have had these (brand new) for a few months now with my Galaxy S8 and all I can say is cool tech but too PREMATURE for Samsung. Thanks Amazon.