Bluetooth connectivity for seamless pairing with devices.Recommended operating distance of 0-15m for optimal performance.Working voltage range of 3.3V to 5V for versatile compatibility.Not waterproof; avoid exposure to water during use.Automatic resumption of last used settings upon power on, ensuring convenience and ease of use. 1. Because the software need Bluetooth when using. Storage permissions, which require specific permissions for the software when it is first installed. According to the prompt box of the mobile phone at the time of installation, the permission to be used is allowed by default. 2. that the Bluetooth function of the mobile phone is turned on when in use. 3. If any Auto has been run last time, the device automatically run the last Auto when it is powered on again. If the last running environment is different from the environment at this time, there may be random walking, which is the reason why the state of the Bluetooth console is maintained. 4. The recommended distance is 0-15m. If the signal is too weak, the signal flickers as normal. 5. The working voltage is 3.3V-5V.Color: OrangeMaterial: ABS Package Contents:1*USB-RMD- pro 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.