Alurateks Universal Bluetooth Audio Cassette Receiver is the perfect way to transform your cars cassette player into a Bluetooth audio receiver, cable free! Perfect for vehicles that have an old stereo cassette player and do not have a built-in auxiliary port. Simply insert the cassette receiver into your cars cassette deck and pair to your smartphone, tablet or MP3 player. In seconds you can stream your favorite songs through your cars speakers. The Universal Bluetooth Audio Cassette Receiver features a built-in rechargeable battery so you can enjoy wireless audio streaming up to 33 feet for up to 8 hours on a full charge. The cassette receiver remembers up to four paired Bluetooth devices and will auto turn off within 5 minutes after disconnected from any device. You can also add Bluetooth receiving functionality to your old cassette stereos and walkmans. No need to throw out your old cassette deck stereos. Keep them alive with Bluetooth connectivity and enjoy the benefits of cable-free music and audio.