Cassette design with strong Bluetooth compatible function, you can insert the cassette into the car cassette player, then connect it to your phone Bluetooth, enjoy the music and hands-free freely and directly. Built-in microphone, the cassette converter supports hands-free calling, easy to receive or end a call with one touch. You don't need to hold the phone while driving or walking on the road. Adopt the latest 5.0 Bluetooth compatible chip, provides more stable performance, steadier and better call quality, wider compatibility and stronger functions, supports you clear, long-lasting and continuous phone call and stereo music. The cassette has USB ports and built-in 130mAh rechargeable battery, safe and durable, you can charge the lamp at any time by connecting to power bank, laptop or other types of USB adapter, convenient to use. Suitable for placing in the car, car and vehicle to enjoy music, hands-free calling and other Bluetooth compatible functions. Bluetooth Compatible Version: 5.0 Power Supply: USB Battery: Built-in 130mAh rechargeable battery Size: 10 x 6.3 x 0.7cm/3.93 x 2.48 x 0.27in Weight: 62g Color: Black Material: ABS Package Contents: 1 x Cassette Adapter 1 x USB Cable The above package contents only, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.