Welcome to the store! 1. You can easily transfer cassette music to your headset or speaker, no need to connect wired headsets or speakers to the cassette player. 2. The auto-reverse function allows you to listen to the A and B sides of the tape repeatedly without manually flipping sides. 3. Built-in Bluetooth transmitter, automatically start searching for paired Bluetooth receiving devices and remind you of the status with indicator lights. 4. Volume adjustment knob and headphone jack, you can connect headphones to listen to music when you don't want to use Bluetooth devices. 5. Five function buttons play, stop, fast forward, rewind, and loop; 2 power options, two AA batteries or USB power. Item Type: Bluetooth Cassette Player Material: ABS Bluetooth: 4.2 Effective Distance: Approx. 10m / 33ft (Related to the Bluetooth receiving device and the surrounding environment) Audio Channel: Left and Right Channel Stereo Audio Input: Cassette Tape Audio Output: Headphone Jack (3.5mm stereo audio interface), Bluetooth Transmitter User Interface: Function Buttons-Play, Stop, Fast Forward, Rewind, Loop Switch, Auto Return. Volume Adjustment Knob, Bluetooth Work Indicator-Blue fast flashing means searching for pairing, slow flashing means pairing succeeded working, off indicates connection failed. Power Supply: 2 x AA Batteries, or DC 5V USB Power Supply (this product does not come with batteries) 1 x Bluetooth Cassette Player 1 x USB Cable 1 x Headphones 1 x Manual