Compact and exquisite in appearance, with a simple overall design, it's just a black cube. This device allows users to easily wirelessly transmit, play, and control their devices, such as an iTouch, or audio files stored on Bluetooth devices within a 10-meter distance. The standard 30-pin line output can be directly connected to a front subwoofer or front audio line input, with an output level sufficient to achieve maximum audio output without the need for additional line amplification. Wireless audio source switching and zero-plug functionality are achieved by connecting and disconnecting different transmission devices, eliminating the hassle of plugging and unplugging cables to switch audio sources in traditional audio equipment. Users are freed from the limitations of connecting cables and can enjoy Hi-Fi music anywhere in the room without placing the audio source within one meter of the speaker. It supports Bluetooth 5.1 protocol specifications, Lingo protocol, and device certification, and supports automatic identification of certified and uncertified subwoofers. Transmission distance: at least 10 meters. Interface: standard 30-pin interface. When not connected, two indicator lights flash alternately; after successful connection, the blue indicator light flashes slowly. Product instructions: Device identification: I-WAVE Open the speaker and connect the product to the base. The front and rear LED indicators will start flashing, indicating that it has entered pairing mode and the device is working normally. Since the device is set to automatically reconnect from the factory, please power it on before pairing it with Bluetooth devices. Once the device has entered pairing mode, turn on the Bluetooth function of your computer, mobile phone, or other digital product with Bluetooth output function, search for or find Bluetooth devices, locate the I-WAVE Bluetooth device, and connect. After successful pairing, the front and rear Bluetooth indicator lights will flash slowly, indicating a successful connection, and wireless playback is now possible. If you need to switch the playback device during normal use, you must first disconnect the connected computer, mobile phone, or other Bluetooth output device before pairing and connecting other Bluetooth devices. If you cannot connect, remove the product and place it back in its original position. Note: Only supports analog speakers, not digital speakers. This product is not compatible with car audio systems. This product is not compatible with digital speakers. Color: Black Material: Plastic Size: Approx 44x35x7mm Package Contents: 1 * Bluetooth Receiver/Transmitter Only the above package content is included; other products are not included. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.