Clearity, LLC is a U.S. based manufacturer and developer of hearing aids. Clearity has a rich product development and manufac ... turing history located in Tulsa, OK, dating back to 2001. Clearity is a medical device manufacturer with an ISO 13485 certified quality system. Clearity operates in coordination with our sister company, Listen Clear. For more information about our company and the products we design, manufacture and distribute, please visit the Clearity and Listen Clear websites. read more