Downloadable mobile applications for recording, transmitting, and reproducing sound and video; Downloadable software for measuring and analyzing sound, vibration, and frequency; Downloadable computer software for measuring sound pressure levels as a sound level meter, for analyzing the spectral composition of acoustic signals as a spectrum analyzer, and for measuring and analyzing acceleration, velocity and displacement as a vibration meter; Downloadable software for calibrating microphones, sound sensors, and vibration meters; Downloadable computer software for acoustic measurement, waveform editing, and sound classification using artificial intelligence (AI); Microphones; USB microphones; Microphones for acoustic measurement; Microphone stands; USB cables