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HOUSTON, April 13, 2005 /PRNewswire-FirstCall via COMTEX/ — Input/Output, Inc. (NYSE: IO)
announced today that Bob Peebler, President and Chief Executive Officer and
Mike Kirksey, Executive Vice President and Chief Financial Officer, will be
participating in the 2005 Oil and Gas Investment Symposium New York, scheduled
for April 18 to 20, 2005, at the Sheraton New York Hotel & Towers.

I/O also announced today that the company has entered into an Employment
Inducement Restricted Stock Agreement and an Employment Inducement Stock
Option Agreement with TengBeng Koid, the new Vice President, Business
Development of the company’s Imaging Systems Group, providing for the grant to
Mr. Koid of 20,000 shares of restricted common stock of I/O and stock options
to purchase 55,000 shares of common stock of I/O as a material inducement to
Mr. Koid joining the company.

I/O is the world’s leading, technology-focused seismic solutions provider.
The company provides cutting-edge seismic acquisition equipment, software, and
planning and seismic processing services to the global oil and gas industry.
I/O’s technologies are applied in both land and marine environments, in
traditional 2D and 3D surveys, and in rapidly growing areas like time-lapse
(4D) reservoir monitoring and full-wave imaging. Headquartered in Houston,
Texas, I/O has regional offices in Canada, Europe, China, Russia and the
Middle East. Additional information is available at

CONTACTS:  J. Michael Kirksey
               Chief Financial Officer
               Input/Output (281) 879-3672

               Jack Lascar, Partner
               Karen Roan, SVP
               DRG&E (713) 529-6600

SOURCE Input/Output, Inc.

J. Michael Kirksey, Chief Financial Officer, Input