I have buy this headphone in rs .450 from indra bhwan allahabad. first time when I listen music I feels problem in left ear speaker. But when I go to seller stole he told me this is new technology of I ball to safe your ear. But I recommend you if you want to buy this headphone listen at least a minute and then pay for it. The left ear speaker sound is treble there is no bass in left and right side ear is full of bass.