A piezo electric flash is a small photographic flash bulb, often housed in flash cubes, that can be triggered using a very low electrical current generated by a piezoelectric element. When the piezo is struck, it produces a brief voltage sufficient to ignite the flash, providing instantaneous illumination for photography.
These flashes were commonly used in compact cameras and early consumer photography, offering a convenient and reliable way to light subjects without bulky equipment. Piezo electric flashes highlight the integration of electronic and mechanical principles in photographic lighting technology.