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 for , for iTouch via Bluetooth. Or any audio files in the Bluetooth device. The standard 30-PIN line output port can be directly connected to the pre-bass or pre-audio line input port, and the output level can make the sound reach full power without additional line amplification. By connecting and disconnecting different transmission equipment, the function of cable-free audio source switching and zero plug-in and plug-in can be realized, saving the trouble of connecting and unplugging the cable to traditional audio equipment to switch audio sources. Free the user from the shackles of the connection cable, so that the user can enjoy hi-fi music anywhere in the room without having to place the audio source 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: at least 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, connect the product to the docking station, and the front and rear LED lights will start to flash, indicating that it has entered the pairing mode, indicating that 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 has entered 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 I-WAVE Bluetooth device to connect, After the pairing is successful, the front and rear Bluetooth 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 disconnect the connected computer, mobile phone and other Bluetooth output devices, and then pair and connect to other Bluetooth devices. If you cannot connect, remove the product and reinsert it. Note: Only analog speakers are supported, digital speakers are not supported. This item is not compatible with for car stereo systems. This item is not compatible with for digital speakers. Color: Black Material: Plastic Size: Approx. 44x35x7mm Package content: 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 allowed measurement error is +/- 1-3 cm.