1. Bluetooth Cassette Player: You can transfer tape music to other Bluetooth receivers, such as Bluetooth speakers, headphones. When the device is powered on, it will automatically search for the Bluetooth receiver, but you may need to set pairing on the Bluetooth receiver when connecting. 2. Automatic Rewind: Cassette player with automatic rewind function. You can choose to listen to music on one or both sides according to your preferences. Just click the DIR button and the other side will play automatically. 3. Portable and Multifunctional: The portable size allows you to play and transfer music anytime and anywhere, and enjoy music anytime and anywhere. Connect your Bluetooth speaker or headset via Bluetooth to support 3.5mm AUX audio cable to connect to your car speaker. 4. Stereo Sound Quality: The sound quality depends on the life and quality of the tape. This portable Bluetooth cassette player audio sampling rate supports 44.1 and 48kHz at 16-bit, and supports high-quality stereo L/R output. 5. Easy to Use: This portable Bluetooth cassette player is lightweight and small. It is powered by 2xAA batteries or USB power. When connected to your Bluetooth receiver for flexible operation, be careful not to use two Bluetooth receivers at the same time.