Miniature Audio Devices from Transducers USA miniature audio devices, microphone, speaker, audio, beeper, buzzer, miniature microphone, miniature speaker, miniature audio devices, miniature beeper, miniature buzzer Transducers USA offers miniature audio devices, such as sounders/beepers/buzzers/speakers and microphones, at exceptional prices. Transducer USA's minature audio devices can be mounted directly on PC boards, or externally mounted and wire with leads.