3Pcs M18 Bluetooth-Compatible Audio Receiver Module, Wireless Stereo Sound Decoder Board with L R Audio Output, 3.7V–5V Power Input and LED Indicator for DIY Speaker and Amplifier Projects

Product Description This module is a Bluetooth-compatible audio receiver board designed for wireless audio input applications. It receives audio signals via Bluetooth-compatible and outputs analog stereo sound through left and right audio channels. The module supports Bluetooth-compatible 4.2 communication and automatic pairing after power‑up. Audio output can be connected to an external amplifier, active speaker, or audio processing circuit. The board operates on a 3.7V to 5V DC power supply and can be powered by a lithium battery or regulated DC source. An onboard LED indicator provides visual feedback for Bluetooth-compatible connection status. The compact design allows easy integration into DIY audio systems, wireless speaker projects, and embedded audio applications.  Technical Specifications Module Type: Bluetooth-compatible audio receiver module Bluetooth-compatible Version: 4.2 Audio Output: Stereo analog output (L / R / GND) Supported Audio Formats: Common compressed and lossless audio formats (device dependent) Power Supply Voltage: DC 3.7V – 5V Power Input Type: Lithium battery or DC power supply Wireless Frequency: 2.4 GHz band Transmission Distance: Up to approx. 10–20 m (open environment) Indicator: Onboard LED for connection status PCB Mounting: Semi‑hole solder pads Board Size: Approx. 23mm × 16mm Operating Temperature: −10°C to +60°C Application: Wireless audio receiving and decoding

• This wireless audio receiver module is designed to receive audio signals over Bluetooth-compatible and output analog stereo sound. It allows external audio systems to accept wireless audio input without complex digital audio processing circuits.
• Supports Bluetooth-compatible 4.2 communication and provides stable wireless audio transmission. After power is applied, the module can be paired with compatible devices and begins streaming audio through its stereo output channels.
• Provides left and right channel analog audio outputs, allowing direct connection to audio amplifiers or powered speaker circuits. The stereo output supports standard line‑level audio integration in DIY audio projects.
• Operates with a DC supply voltage from 3.7V to 5V, supporting both lithium battery power and regulated DC power sources. This flexibility makes the module suitable for portable and fixed audio systems.
• Includes an onboard status indicator LED that displays connection state. The compact PCB with semi‑hole pads supports soldering or direct integration into custom circuit boards and prototype assemblies.