Knowles Acoustics Ships 1 Billionth Sisonic MEMS Microphone

ITASCA, Ill.--(Business Wire)--
Knowles Acoustics has reached a major milestone in the history of MEMS
technology with the shipment of its 1 Billionth SiSonic surface mount MEMS
microphone. Knowles Acoustics, which shipped its first MEMS Microphone in 2003,
is currently ranked in the top 5 Global Market Share Suppliers of MEMS for
Consumer and Mobile Applications (Source: iSuppli Corp. January 2009) and is the
world leader in MEMS-based silicon microphone manufacturing.

When utilized in the SiSonic patented microphone package, MEMS technology yields
a low profile, robust component exhibiting low vibration sensitivity,
environmental stability, and ultimately more efficient use in customer
applications as a high volume surface mountable microphone. Today, with over 30
part models and multiple generations available, SiSonic is recognized as the
preferred acoustic component in mobile phones, laptops, gaming systems, and
headsets.

In 2004, to address growing demand, Knowles opened a new 80,000 square foot
state-of-the-art manufacturing facility dedicated solely to SiSonic production.
Located in Suzhou, China, the facility is highly scalable, capable of producing
all SiSonic variations, and has provided the technology, manufacturing and
logistical infrastructure necessary for Knowles to sustain future growth and
meet the needs of global customers.

"Knowles` long term commitment, willingness to venture into new territories,
finding the `right` suppliers, and financial investment, are all key ingredients
to the success of the SiSonic MEMS Microphone," said Jeffrey Niew, President of
Knowles. "Shipping one billion MEMS microphones is a momentous achievement which
illustrates Knowles` dedication to not only produce revolutionary products, but
to be visionaries in the world of acoustics and beyond."

About Knowles Acoustics

Knowles is the world leader in microacoustic technology for the Hearing Health
Industry. Leveraging the company`s heritage of 60 plus years supplying acoustic
expertise to this market, Knowles Acoustics has applied this capability to new
markets and customers. Knowles is a leading supplier of acoustic interface
solutions; specifically MEMS surface mount microphones, subminiature electret
microphones, balanced armature speakers and speech enhancement software. Knowles
is owned by Dover Corporation, a multi-billion dollar, global producer of
innovative equipment, specialty systems and value-added services for the
industrial products, fluid management, engineered systems and electronic
technology markets. For more information visit Knowles at www.knowles.com or
call 630-250-5935.

All product and trade names are recognized as the property of their respective
owners.

Knowles Acoustics
Teresa Bosch-Wachtel, 630-250-5935
teresa.bosch@knowles.com

Copyright Business Wire 2009