Compact and exquisite in appearance, with a simple overall design, it is just a black cube. This device allows users to wirelessly transmit, play, and control audio files from devices such as iTouch or other Bluetooth devices within a 10-meter range via Bluetooth. The standard 30-pin line output can be directly connected to a subwoofer or audio line input, with an output level sufficient for full power without the need for additional line amplification. By connecting and disconnecting different transmission devices, wireless audio source switching and zero-plug functionality are achieved, eliminating the hassle of plugging and unplugging audio device cables to switch audio sources. Free yourself from the limitations of connecting cables and enjoy high-quality music anywhere in the room, without having to place the audio source within one meter of the speaker. Supports Bluetooth 5.1 protocol specifications, Lingo protocol, and device certification, and supports automatic identification of certified and uncertified subwoofers. Transmission distance: Not less than 10 meters. Interface: Standard 30-pin interface. When not connected, the 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 operating normally. Since this device is set to automatic pairing, manually enable Bluetooth on your device to pair. Once the device has entered pairing mode, turn on the Bluetooth function on 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 that the connection is successful and wireless playback is possible. If you need to switch playback devices during normal use, disconnect the connected Bluetooth output device (computer, mobile phone, etc.) before pairing and connecting with other Bluetooth devices. If you cannot connect, remove the product and reinsert it. 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. Dimensions: Approximately 44x35x7 mm. Package Contents: 1 * Bluetooth receiver/transmitter. Only the above package content is included; other products are not included. Note: Light during shooting and different displays may cause the color of the product in the image to differ slightly from the actual product. The measurement tolerance is +/- 1–3 cm.