Features: - The converter can convert MP3, MP4, computer, mobile phone and other players supporting BT function into car cassette tapes. - Easy to operate, you just need to insert the converter into your car cassette player after BT pairing, and then press to play and enjoy music. - Support BT answering / making calls, music playing (audio format: AAC, MP3, SBC, stereo) - Clear sound and good sound quality, providing a wonderful hearing enjoyment. - With the built-in lithium battery, recharging & recyclable, more convenient and economical. - With this converter, you can enjoy your favorite music during driving or through household players, no longer restricted by radio station, making your driving and life more relaxing. Specifications: Material: ABS Color: Black Power Supply: 1 * 3.7V 120 mAh battery Item Size: Approx. 10.2*6.4*1.2cm / 4.02*2.52*0.47in Item Weight: Approx. 37.5g / 1.32oz Package Size: Approx. 19*11.2*1.3cm / 7.48*4.41*0.51in Package Weight: Approx. 52.5g / 1.85oz Packing List: 1 * Cassette Tape Converter