With The ION ITR20 cassette adapter Bluetooth your cars cassette player instantly becomes a wireless Bluetooth receiver. Just like that, you can stream music from any Bluetooth music player or phone. No complicated installation. No cables. No tangled or snagged tape. Just pop it in and it automatically turns on. Cassette adapter Bluetooth contains a long-lasting rechargeable battery for even the longest road trips. Plus, you now have a hands-free solution for phone calls, thanks to the built in microphone.Now, you can use your cars speakers to hear phone calls and music without having to buy a new stereo head-unit. Both of your hands stay safe on the wheel while your audio source stays in your pocket. Cassette Adapter Bluetooth is the last cassette you'll ever need and the first and only step to bring your favorite music, podcasts, and audiobooks into your car.