1. The tape is designed with Bluetooth compatibility. You can insert the tape into a car tape player and then connect it to your phone via Bluetooth to enjoy music and hands - free functions. 2. With a built - in microphone, this tape converter supports hands - free calls. You can easily answer or hang up the phone with one click, so you don't need to hold your phone while driving or walking. 3. It uses a Bluetooth 5.0 compatible chip, which offers stable performance, stable call quality, strong compatibility and various functions, supporting clear, long - lasting and continuous calls and stereo music playback. 4. The tape is equipped with a USB interface and a built - in 130mAh rechargeable battery, which is safe and durable. You can charge it by connecting it to a power bank, laptop or other USB adapters, making it convenient to use. 5. It is suitable for use in vehicles such as cars and motor vehicles to enjoy music, hands - free calls and other Bluetooth - compatible functions. 6. Bluetooth compatible version: 5.0 7. Power supply: USB 8. Battery: Built - in 130mAh rechargeable battery 9. Dimensions: 10 x 6.3 x 0.7 cm / 3.93 x 2.48 x 0.27 inches 10. Weight: 62 grams 11. Color: Black 12. Material: ABS 13. Package contents: 1 tape adapter, 1 USB cable 14. Only the above package contents are included, and other products are not included. 15. Note: Light reflection and different monitors may cause slight differences in the color of the item in the picture compared to the actual product. A measurement error of plus or minus 1 - 3 cm is allowed.