EasyLifeCare&reg; 3.5mm Stereo Output to Cassette Adapter - AUX interface for Cassette Player - Line In Connection from Smartphones to Cassette Music System - Play music from phones or MP3 Players to Cassette in Cars - Make Hand Free Calls by playing back conversations through Cassette Speaker Connect iPhone, iPod, Android phone, MP3 Player and CD Player to the Adapter to play music from cassette deck at home or in Sedan SUV Trucks Works with all cassette deck brands and models - Convert your favorite Cassette sound system with your modern new gadgets in seconds No wiring required, No battery required, Just plug it in to Connects to headphone jack or line output of your smartphones or portable media players