Since there is no fixed standard for headphone connections, there are two cables in the box, with different polarity. If one cable does not give good audio results, try the other cable. This usually solves the problem. The majority of phone models (Apple, Samsung from Galaxy S2 model, LG, HTC, Sony, Motorola, Blackberry) require the audio cable with the silver plugs. Pin assignment in this cable from the tip of the plug: R/L/Ground/Microphone. However, some manufacturers, such as some models from Nokia, require a cable with different pin assignment, (R/L/Microphone/Ground). In this case, you should use the audio cable with the black plugs.