Cellet Cassette Audio Adapter for iPhone / iPod / Android Phones / MP3 Players and CD Players - Retail Packaging ALLOWS you to play music from your smartphone, iPod or MP3 player in your car SAVE MONEY- inexpensive alternative to replacing your cars cassette deck, listen to digital music through your car speakers using this adapter LIGHTWEIGHT, compact design for easy storage and carrying NO batteries needed to operate; works with car electrical system COMPATIBLE to any music player with 3.5 headphone/audio jack