This 3.5 mm audio cable allows you to connect any portable audio device with a standard 3.5 mm jack, such as an MP3 player, smart phone, microphone, laptop or iPod, to your car stereo or home speaker system. Has an additional conductor that allows you to extend the length of your 3.5 mm headset that supports microphone. Its compact, coiled design has a resting length of just over 1FT, but can reach up to 3FT in length.