The appearance is small and elegant. The overall appearance is just a simple black square. Through this device, users can sit 10 meters away and easily wirelessly transmit, play, and control your iTouch via Bluetooth. Or optional audio files on the Bluetooth device. The standard 30PIN line output can be directly connected to the base unit or audio input, and the output level can make the sound reach full power without additional line amplification. Through the connection and disconnection of different transmission equipment, the function of audio source switching without cables and zero connection and disconnection can be realized, saving the trouble of plugging and unplugging the cable of traditional audio equipment to switch the audio source. Frees the user from the shackles of the connection line, allowing the user to enjoy hi-fi music anywhere in the room without having to place the audio source device within one meter of the speaker. Supports Bluetooth 5.1 protocol specification. Supports Lingo protocol and device authentication. Supports automatic identification of certified and non-certified base audio. Transmission distance: not less than 10 meters. Interface: standard 30-pin interface. 2 indicator lights flash alternately when there is no connection, and the blue light flashes slowly after connection. Product instructions: Equipment identification: I-WAVE Turn on the speaker, plug the product into the docking station, and the front and rear LED lights will start flashing, indicating that it has entered pairing mode and the device is working normally. Since the machine is factory set to automatically reconnect, please turn it on before pairing the Bluetooth device. After the device enters pairing mode, turn on the Bluetooth function of the computer, mobile phone, etc., and other digital products with Bluetooth output function, and search or find the Bluetooth device, find the Bluetooth device of I-WAVE to connect. After the pairing is successful, the front and rear Bluetooth will flash slowly, indicating that the connection is successful and you can connect wirelessly. If you want to switch the playback device during normal operation, you need to disconnect the connected computer, mobile phone, and other Bluetooth output devices, and then pair and connect other Bluetooth devices. If you cannot connect, please remove the product and reinsert it. Note: Only analog speakers are supported, digital speakers are not supported. This product is not compatible with car stereos. This item is not compatible with digital speakers. Color: black Material: plastic Size: about 44x35x7mm Package contents: 1 * Bluetooth receiver/transmitter Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.