Features: Wireless BT Connection: This BT cassette player can wirelessly transmit cassette music to your BT headphones or speakers, eliminating the need for wired headphones or speakers, and allowing you to enjoy the convenience of wireless. Multiple Power Supply Methods: The device can be powered by 2 AA batteries or USB, providing multiple power supply methods to meet your different needs. Auto Reverse Function: With the auto-reverse function, you can choose to listen to music on one side or both sides according to your preference, which is simple and convenient to operate. High-Quality Sound: Using BT technology, you can wirelessly stream your favorite songs from a distance. The sound quality depends on the feasibility and quality of the cassette, providing a high-quality sound experience. Portable Design: The device is small and portable, it can be your perfect companion wherever you go, allowing you to enjoy music anytime, anywhere. Note: Batteries are not included Specification: BT Version: BT 4.2 Effective Distance: About 10m Supporting Agreement: A2DP, AVRCP, AVCTP, AVDTP, HFP, SPP, SMP, ATT, GAP, GATT, RFCOMM, SDP, I2CAP Signal-Noise Ratio: ＞90db Frequency Range: 2.402GHz - 2.480GHz Audio Channel Stereo: L/R Audio Input: Cassette tape Audio Output: 3.5mm earphone jack, BT transmitter Control Buttons: PLAY, STOP, F.F, REW, DIR. Auto reverse switch, Volume control. LED indicator: Quick flash for search BT receiver, slow flash for pair successful. Power Supply: 2*AA Battery, or USB port power supply (5V DC adapter) Package Contents: ezcap215 BT Cassette Player, USB power cable, Earphone, Manual Bit Rate: 128Kbps Product Size: 113 x 85 x 32 mm Product Weight 180g Package Size: 160*112*42mm Package Weight: 255g Package list: 1* BT Cassette Player 1* USB Cable 1* Earphone 1* User Manual