BESDATA Car Cassette Player Adapter Hands Free Calling and Music Cassette Adaptor with Mic, Black Push button for controlling phone functions. Answer/End Call, play/pause, skip tracks, activate Siri. Your every word will come through clearly thanks to the HD Voice microphone. Car cassette decks that have side tape opening and ANY MP3 player / for iPod / for iPhone / Mobile Phone that has the normal 3.5mm audio headphone jack. Spring-loaded cassette head helps maintain contact with cassette player's head for clear sound. Cable designed specifically for the harsh mobile environment.