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HOUSTON, Dec 17, 2003 /PRNewswire-FirstCall via Comtex/ — Input/Output, Inc. (NYSE: IO)
announced today that the initial purchaser of I/O’s 5.50% Convertible Senior
Notes due 2008 has exercised its over-allotment option and purchased an
additional $10 million aggregate principal amount of the notes. The primary
offering of $50 million aggregate principal amount of notes closed on
December 10, 2003. As a result, the total principal amount of the notes
issued by I/O is $60 million.

The notes bear interest at the rate of 5.50% per annum and are convertible
into shares of I/O common stock at a conversion rate of 231.4815 shares of
common stock per $1,000 principal amount of notes. This conversion rate is
equivalent to an initial conversion price of $4.32 per share of common stock,
subject to adjustments in certain circumstances.

I/O has applied approximately $16 million of the net proceeds of the notes
offering to repay existing indebtedness and intends to use the balance of the
net proceeds for potential acquisitions.

The notes have been offered and sold only to “qualified institutional
buyers” in accordance with Rule 144A under the Securities Act of 1933, as
amended (the “Securities Act”). The notes and the shares of common stock
issuable upon conversion of the notes have not been registered under the
Securities Act and may not be offered or sold in the United States absent
registration or an applicable exemption from registration requirements. This
press release does not constitute an offer to sell or the solicitation of an
offer to buy any of the notes or the shares of common stock issuable upon
conversion of the notes, and shall not constitute an offer, solicitation or
sale in any jurisdiction in which such offer, solicitation or sale is
unlawful. This press release is being issued pursuant to Rule 135c under the
Securities Act.

I/O is a leading provider of seismic acquisition imaging technology for
exploration, production and reservoir monitoring in land and marine, as well
as shallow water and marsh environments.

Contact: Brad Eastman

Chief Administrative Officer


(281) 879-3605

Jack Lascar, Partner

Karen Roan, Vice President

DRG&E / (713) 529-6600

SOURCE Input/Output, Inc.

Brad Eastman, Chief Administrative Officer of Input-Output, Inc., +1-281-879-3605; or Jack Lascar, Partner, or Karen Roan, Vice President,
both of DRG&E, +1-713-529-6600, for Input-Output, Inc.