1Bluetooth Cassette Player: You can transfer tape music to other Bluetooth receivers, such as Bluetooth speakers, headphones. After the device is powered on, it will automatically search for the Bluetooth receiver, but you may need to set up pairing on the Bluetooth receiver when connecting. 2Automatic 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 it will automatically play the second side. 3Portable And Multifunctional: The portable size allows you to play and transfer music anytime, anywhere, and enjoy music anytime, anywhere. Connect your Bluetooth speaker or headset via Bluetooth to support 5 mm AUX audio cable to connect to your car speaker. 4Stereo Sound Quality: The sound quality depends on the viability and quality of the tape. This portable Bluetooth cassette player audio sampling rate supports 41 and 48kHz at16bit, and supports high quality stereo L/R output. 5Easy To Use: This portable Bluetooth cassette player is light and small. It runs on 2xAA batteries or USB power. When connected to your Bluetooth receiver for flexible operation, please be careful not to use two Bluetooth receivers at the same time.