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 adopts SMT process, stable and reliable quality, neat storage area. LED Indicator: Designed with LED indicator, it is convenient for you to check the connection status. (fast flashing: waiting for connection; slow flashing: playing sound; solid light: connected) Protection: Input reverse connection protection, the device will not burn if reversed. Easy Bluetooth connection: Enable the Bluetooth function of the mobile phone or other devices that support Bluetooth audio streaming output (such as laptops, tablets, etc.), and the mobile phone will automatically search and pair with the module. No need for pairing code or button mash; effective transmission distance: 10-15 meters.