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 suitable for , suitable for iTouch via Bluetooth. Or all audio files in the Bluetooth device. The standard 30PIN line output port can be directly connected to the suitable for base or the suitable for audio line input port, and the output level can make the audio reach full power output without additional line amplification. Through the connection and disconnection of different transmitting equipment, the function of audio source switching without wiring and zero plugging and unplugging can be realized, which saves the trouble of plugging and unplugging the cable suitable for traditional audio equipment to switch the audio source. Release the shackles of the connecting line on the user, so that the user can enjoy high-fidelity music anywhere in the room without having to place the audio source device within one meter of the speaker. Support Bluetooth 5.1 protocol specification. Support Lingo protocol and device authentication. Support automatic identification of certified and non-certified base audio. Transmission distance: not less than 10 meters. Interface: standard 30pin 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 seat, and the front and rear LED lights begin to flash , indicating that it has entered the pairing mode, indicating that the device is working normally. Since the machine is factory defaulted to automatically reconnect, please turn it on suitable for besuitable fore pairing the Bluetooth device. After the device enters the pairing mode,turn on thebluetooth 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 LEDs will flash slowly,indicating that the connection is successful,and you can wirelessly. During normal operation,if you want to change the playback device,you need to interrupt the connected computer,mobile phone and other Bluetooth output devices,and then pair and connect with 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 item is Not Compatible with suitable for Car Stereo System. This item is Not Compatible with suitable for Digital Speakers. Colour: black Material: plastic Size: about 44x35x7mm Package Contents: 1 * Bluetooth Receiver Transmitter Only the above package content, other products are not included. Note: Light 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.