There is no formal definition of a Micro-Speaker. At BeStar we define a micro-speaker as any speaker where at least one dimension is 20mm or less. We have a variety of configurations and terminations, including contact pads, spring contacts and wire leads. Micro-Speakers are mostly used in mobile communication devices and any hand held devices needing voice quality sound. We have additional micro-speaker models available in catalogs, which can be found under the resources tab.