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HOUSTON, July 25 /PRNewswire-FirstCall/ — Input/Output, Inc. (NYSE: IO)
announced today that it will release second quarter 2005 results on Wednesday,
August 3, 2005 after the market closes. In conjunction with the release, I/O
has scheduled a conference call, which will be broadcast live over the
Internet, for Thursday, August 4, 2005 at 9:30 a.m. Eastern Time (8:30 a.m.
Central).


    What:   I/O Second Quarter Earnings Conference Call

    When:   Thursday, August 4, 2005 - 9:30 a.m. Eastern Time

    How:    Live via phone -- By dialing (303) 262-2142 and asking for the I/O
            call at least 10 minutes prior to the start time.
            Live over the Internet -- by logging on to the web at the address
            below.

    Where:  http://www.i-o.com .  The webcast can be accessed from the home
            page.

For those who cannot listen to the live call, a telephonic replay will be
available through August 11, 2005, and may be accessed by calling
(303) 590-3000 using pass code 11035344. Also, an archive of the webcast will
be available shortly after the call on the company’s website at
http://www.i-o.com for approximately 12 months.

I/O is a 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, Latin America, Europe, China,
Russia, Africa and the Middle East. Additional information is available at
http://www.i-o.com .


     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.

CONTACT: J. Michael Kirksey, Chief Financial Officer of Input-Output,
Inc., +1-281-879-3672; or Jack Lascar, Partner, or Karen Roan, SVP, both of
DRG&E, +1-713-529-6600, for Input-Output, Inc