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The BT201 Dual Mode 5.0 Bluetooth Lossless Audio Power Amplifier is a compact and efficient Bluetooth audio module that offers lossless sound quality for wireless streaming and hands-free communication. Operating on 5V, it’s perfect for DIY speakers, portable audio systems, and smart home audio setups.
The CA-6928 Bluetooth Stereo Audio Module with a 3.5V-5V power amplifier provides wireless stereo audio streaming and high-quality sound amplification, making it ideal for portable Bluetooth speakers, DIY audio projects, and wireless audio systems.
The MH-MX8 Wireless Bluetooth MP3 Audio Receiver Board with Bluetooth 4.2 is a versatile and high-quality solution for adding wireless audio streaming to your projects. Supporting MP3 lossless decoding, it’s perfect for DIY Bluetooth speakers, home audio systems, and portable sound solutions.
The VHM-314 Bluetooth Audio Receiver MP3 Decoder Board XY-BT-MINI offers seamless wireless audio streaming with MP3 decoding, operating on 3.7-5VDC. Ideal for DIY audio projects, portable speakers, and wireless audio systems.
2N5550 TO-92 NPN High-Voltage Transistor 
Arduino UNO Expansion Board Normal Quality 
AD828 Mono Dynamic Microphone Pre-Amplifier Module 3.8-15VDC 