The Bluetooth receiver module has a wide DC 5-35V input voltage range and supports 5V micro USB power supply. FULL SURFACE MOUNT TECHNOLOGY: This Bluetooth receiver uses SMT process, stable and reliable quality, neat storage space. LED Indicator: Designed with LED indicator, making it convenient for you to check the connection status. (fast flashing: waiting for connection; slow flashing: playing audio; solid light: connected) Protection: Input reverse connection protection, the device will not burn if it is reversed. Easy Bluetooth Connection: Enable the Bluetooth function on your mobile phone or other devices that support Bluetooth audio streaming (such as laptops, tablets, etc.), and your mobile phone will automatically search and pair with the module. No pairing code or button press needed; effective transmission distance: 10-15 meters.