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 Portable Multi-purpose Waalkman: 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 Easy to Use: Lightweight and compact. It runs on 2*AA battery ( not included) or USB power, connected to your bluetooth receivers for flexible operation. Features: The bluetooth cassette player has a built-in bluetooth transmitter, which can send the cassette music to your bluetooth speaker or bluetooth headset, and you can easily enjoy the cassette through the bluetooth speaker Auto Reverse: The bluetooth cassette player has five function buttons , play, stop, fast forward, fast reverse and loop, and an auto rewind switch. The auto rewind function allows you to listen to both sides of the tape repeatedly without having to switch sides manually. With volume adjustment knob and headphone jack Specification: Bluetooth: 4.2 Effective distance: about 10 m Audio channel: left and right channel stereo Audio Input: Cassette Audio output: headphone jack (3.5mm stereo audio jack), Bluetooth transmitter Pairing, slow flashing means pairing is working successfully, off means no pairing is successful. Power supply: 2 x AA batteries, or DC 5V USB power supply (battery not included) Size Chart: 113x85x32cm/44.49x33.46x12.60inch Package Includes: 1 Piece bluetooth cassette player 1 Piece USB power cable 1 Piece earphone 1 Piece manual