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HOUSTON, Jul 12, 2004 /PRNewswire-FirstCall via COMTEX/ — Input/Output, Inc. (NYSE: IO)
announced today that it will release second quarter 2004 results on Wednesday,
July 28, 2004 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, July 29, 2004 at 9:30 a.m. eastern time.

     What:  I/O Second Quarter Earnings Conference Call

     When:  Thursday, July 29, 2004 - 9:30 a.m. eastern time

     How:   Live via phone - By dialing (303) 262-2141 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 5, 2004, and may be accessed by calling
(303) 590-3000 using pass code 11002858. 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 90 days.

I/O is the world’s leading, technology-only seismic services provider.
The company provides cutting-edge seismic acquisition equipment, software, and
planning and seismic processing services to the global oil and gas industry.
The company’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. I/O has offices in the
United States, Canada, Europe, China, Russia 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, Vice President
                DRG&E  (713) 529-6600

SOURCE Input/Output, Inc.

J. Michael Kirksey, Chief Financial Officer of Input/Output,
+1-281-879-3672; or Jack Lascar, Partner, or Karen Roan, Vice President, both
of DRG&E, +1-713-529-6600