1.Cassette AdapterWith the Bluetooth cassette adapter, your cassette recorder instantly becomes a wireless Bluetooth cassette player in your car or home, and you can use the 5.0 version of the Bluetooth program immediately. For your car or home system.2. [Applicable] Supports stereo music playback, audio formats: AAC, MP3, SBC, stereo supports Bluetooth 5.0+EDR and is backward compatible with: 4.2, 4, 3.0, 2.1 and other Bluetooth devices.3.Hands-free callingSupports bluetooth to answer/make calls, built-in microphone, you can answer or make calls easily and conveniently.4.Easy to UseStream music from any Bluetooth-enabled device (such as mobile phones, tablets, etc.) without complicated installation, no cables, and no tangles.5. [Rechargeable] The second generation Bluetooth cassette adapter contains a long-lasting battery, built-in lithium battery, and is rechargeable. The charging port, power switch and microphone button can be hung on the outside of the recorder, so you can charge while listening to music. The Bluetooth Cassette Adapter is the last cassette tape you need to bring your favorite music, podcasts, and audiobooks into your car.Specification:Support Bluetooth to answer/make callsSupport stereo music playbackAudio formats: AAC, MP3, SBC, stereoSupport Bluetooth 5.0+EDRBackwards compatible: 4.2, 4.0, 3.0, 2.1 and other Bluetooth devicesTwo indicator lights (1 blue, 1 red)Transmission distance: 10m.Battery capacity: 140mA.Charging current: 80mA.Coupling current: 8 mA, standby current: 2 mAPlay music, make phone calls, current 30mAWorking voltage: 3.3-4.2Vwhat you get1 x car radio cassette adapter1 data line