MONTREAL, QUEBEC -- (MARKET WIRE) -- May 22, 2007 -- SonoCustom®, the advanced custom-molded hearing technology developed and patented by Sonomax Hearing Healthcare Inc. of Montreal (TSX VENTURE: SHH), now licensed exclusively in North America to Aearo® Technologies which markets and sells an improved version of this technology under its E-A-R® brand as CustomEar®, has been found to be safe and effective in protecting the hearing of workers in noisy environments according to a major study conducted by NIOSH, the National Institute for Occupational Safety and Health. NIOSH sets the standard for noise exposure in the workplace in the United States and reports directly to the CDC, the Centers for Disease Control and Prevention, a division of the US Department of Health and Human Services.