for something that be about half the price of every other set of Bluetooth stereo headphone out there , I be expect something with a terrible build and limited functionality . these be pretty amazing , consider ! they be comfortable enough , they sound be great , the build be actually quite good , they seem pretty durable , and the case be surprisingly nice and well build as well . I use these primarily for listen to music on my phone while run or do yard work , and they have prove to make the whole experience much nicer . answer a call while in use be a breeze , and the microphone be adequate for a clear phone call . the only strange little flaw be they tend to loose connectivity if I have my phone in my left pocket -lrb- on the opposite side of my body from the earphone with the receiver -rrb- , though all be well if it be in my right pocket . highly recommend !