Exclusive and unique technique to develop this noise killer earphone with Microphone! No background sound or noise be received through the microphone, so the receiver side will not hear your background sound or noise. It totally only your sound be sent out to the receiver. WORLD ONLY FUNCTION FOR BLUETOOTH EARPHONE!! Act like you are located in very quiet area and no one know you where you are!! Extremely suitable for noisy environment require to calling or receiving phone calls. Tremendous function ever!!
