Bluetooth Cassette Player-- You can transmit the tape music to other bluetooth receivers such as bluetooth speaker/headset. After power supply, the device will auto search the Bluetooth receiver, but you may need to set up pairing on the Bluetooth reciver when connecting (NOT support Bluetooth 5.0 currently)Auto Reverse-- The cassette walkman player with auto-reverse. You can choose to listen to music on one side or both sides according to your preferences. Just click the DIR button and it will automatically play the second sidePortable Multi-purpose Walkman--The portable size allows you to play and transfer music anywhere, enjoy your music anytime. By Bluetooth connect your Bluetooth speakers or headphones support 3.5mm AUX jack, you can use headphones (included) or an audio port to your car speakersStereo Audio Quality] -- Sound quality is depended on audio tape viability and quality. Audio Sample Rates : 44.1 and 48kHz@16-bit,Support high-quality stereo L/R outputEasy to Use-- Lightweight and compact. It runs on 2*AA battery or USB power,when connected to your bluetooth receivers for flexible operation, please be careful not to use Two Bluetooth receivers at the same time