Tape design with strong Bluetooth function, insert the cassette into the car cassette player and connect it to your phone via Bluetooth to enjoy music and hands-free calling instantly. Built-in microphone supports hands-free calling; easily answer or end calls with one button. No need to hold your phone while driving or walking. Equipped with the latest Bluetooth 5.0 chip for stable performance, clear calling quality, wide compatibility, and enhanced functionality, delivering clear, continuous stereo sound and long-lasting call support. The cassette adapter features USB ports and a built-in 130mAh rechargeable battery. Charge conveniently using a power bank, laptop, or any USB adapter. Ideal for use in cars and vehicles to enjoy music, hands-free calls, and other Bluetooth functions. Bluetooth 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 0.27inch Weight: 62g Color: Black Material: ABS Package Contents: 1 x Cassette adapter 1 x USB cable Product includes only the items listed above. Other accessories are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.