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 iPod 30pin interface. Dimensions: 44*36*7mm. 2 indicator lights flash alternately when there is no connection, and the blue light flashes slowly after connection. To use, turn on the speaker, plug the product into the docking seat, and the front and rear LED lights begin to flash rapidly, indicating that it has entered the pairing mode. Then, turn on the Bluetooth function of your device and search for the I-WAVE device to connect. After pairing is successful, the front and rear Bluetooth LEDs will flash slowly, indicating that the connection is successful, and you can play music wirelessly. Package Included: 1x 30 Pin Bluetooth Music Audio Receiver. Notes: Only analog speakers are supported, digital speakers are not supported. This item is Not Compatible with Car Stereo System or Digital Speakers.