Spectrum analyzer DIY kit to build your own mini stereo speaker at home. This soldering project kit includes pickup, microcontroller, and LED, delivering a hands-on and engaging electronics experience. No audio cable required. The speaker uses voice control sensing to automatically detect sound melodies and respond, offering a convenient, cable-free operation. Adjustable sensitivity to fine-tune detection and response for different sound levels. Adjustable parameters to set display update speed, audio response sensitivity, and sampling frequency to fit your setup. Key benefits - Educational and practical: learn soldering, microcontroller basics, and spectrum analysis while building a functional speaker. - Compact, self-contained design: suitable for desktop or small workspace projects. - Interactive visuals: LED indications and spectrum visualization that react to audio input. - Flexible tuning: customize how the device detects and responds to sound through adjustable sensitivity and parameters. Use scenarios - Educational project for classroom or home learning to explore electronics, signal processing, and DIY assembly. - Desk or small room speaker with visual spectrum feedback that operates without cables. - Hobbyist experimentation to adjust sampling frequency, update speed, and other parameters for custom audio sensing and display behavior.