Griffin Technology UNIV35T35MIC Audio Aux Cable with Handsfree MIC for iPhone 4G 4S, Motorola Droid (1, 2, 2 Global, X, X2, Pro, Droid Razr) Samsung Droid Charge, Sidekick 4G, HTC Thunderbolt, HTC EVO 4G Also allows for hands-free calling with integrated microphone Allows for crystal-clear hands-free conversations Automatically pauses music when you receive an incoming call iPhone 4/4S cable plays device music through car stereo