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 Specifications: Product Instructions for Use. Equipment identification: I-WAVE 1. 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, indicating that the device is working normally. Since the machine is factory defaulted to automatically reconnect, please turn it on for 30 seconds before pairing the Bluetooth device. 2. After the device enters the 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, 3. After the pairing is successful, the front and rear Bluetooth LEDs will flash slowly, indicating that the connection is successful, and you can play music wirelessly. 4. 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 this product and reinsert it. That's it. Package Included: 1x 30 Pin Bluetooth Music Audio Receiver Notes: Note: Only analog speakers are supported, digital speakers are not supported. If you can't use this product after receiving the goods, it means that this adapter is not compatible with your speaker, it's not a quality problem, please don't give us bad reviews, thank you This item is Not Compatible with for Car Stereo System. This item is Not Compatible with for Digital Speakers.