Bluetooth version: 5.0 Support protocol: A2DP&AVRCP Frequency range: 2.4Ghz-2.4835Ghz Bluetooth distance: 10m Product operation: Step 1. Plug the product directly into the 30PIN socket compatible for speaker, and the speaker display "". . Open the Bluetooth-compatible device of compatible for , for i-Phone, computer and mobile phone, search for the product device name and pair it with it. Step 3: After the playback device displays a prompt indicating that it is successfully connected to the product, you can wirelessly on the speaker. Scenario 1: When you on the sofa and use the computer to surf the Internet wirelessly, the speaker is not around, and the sound quality of the small speaker that comes with the computer can't meet the hearing needs, so the function of this music receiver is brought into full play. Scenario 2: When you get home and don't want to listen to your favorite songs stored in your mobile phone with headphones, connect this music receiver with your mobile phone's Bluetooth, and the songs in your mobile phone spread throughout the room from the speaker. Color:Black Material:ABS Package Contents: 1 * Bluetooth-compatible Receiver Only the above package content, other products are not included. Note: Light reflection 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.