December 21, 2009 - AED Plus Customers Urged to Upgrade Software INVESTOR CONTACT: A. Ernest WhitonChief Financial OfficerZOLL Medical Corporation+1 (978) 421-9655 MEDIA CONTACT: Diane EganZOLL Medical Corporation+1 (978) email@example.com AED PLUS CUSTOMERS MUST PERFORM SOFTWARE UPDATE AND NOTIFY ZOLL December 21, 2009─CHELMSFORD, MASS.–Earlier this year, ZOLL Medical Corporation (Nasdaq GS: ZOLL) began to execute a field corrective action on its AED Plus® automated external defibrillator. While the Company has made multiple notifications, due to the broad range of customers involved the corrective action continues. In order to ensure defective devices have been remedied, the Company has increased its efforts to notify customers via mail and telephone. Customers who have not yet performed the required software update AND submitted confirmation to ZOLL are urged to do so as soon as possible. The Company had determined that some batteries do not work properly when used with ZOLL AED Plus defibrillators manufactured prior to February 12, 2009 (serial numbers below X_ _ _200000). The previous version of ZOLL AED Plus Self-Test Software did not adequately detect defective batteries, which could lead to a failure to deliver defibrillation shocks during treatment of sudden cardiac arrest. ACTIONS TO TAKE: All AED Plus devices with serial numbers below “X_ _ _200000” must be upgraded with the latest software release. The software update can be easily downloaded from the Company’s web site and installed by the user. Users must send ZOLL an acknowledgement that the corrective action has been implemented after updating the device software. This confirmation is required for customers to avoid liability and for ZOLL to ensure defective devices have been remedied. More information on this corrective action, including instructions for downloading software, sending ZOLL the acknowledgement, and ordering replacement batteries is available at http://www.zollaedplusbatteryhelp.com/ Customers can also call ZOLL Technical Support at 1 (800) 348-9011 or email Tservice_AED@zoll.com This action does not apply to AED Plus devices manufactured after February 12, 2009 (serial numbers above X_ _ _200000). About ZOLL Medical Corporation ZOLL Medical Corporation develops and markets medical devices and software solutions that help advance emergency care and save lives, while increasing clinical and operational efficiencies. With products for defibrillation and monitoring, circulation and CPR feedback, data management, fluid resuscitation, and therapeutic temperature management, ZOLL provides a comprehensive set of technologies which help clinicians, EMS and fire professionals, and lay rescuers treat victims needing resuscitation and critical care. A NASDAQ Global Select company and a Forbes 100 Most Trustworthy Company for the past three years, ZOLL develops and manufactures its products in the United States, in California, Colorado, Illinois, Massachusetts, Pennsylvania, and Rhode Island. More than 400 direct sales and service representatives, 1,100 business partners, and 200 independent representatives serve our customers in over 140 countries around the globe. For more information, visit www.zoll.com. Certain statements contained in this press release, including statements regarding the future business of the Company, and other statements contained herein regarding matters that are not historical facts, are “forward-looking” statements (as defined in the Private Securities Litigation Reform Act of 1995). Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements include, but are not limited to, those factors discussed in the section entitled “Risk Factors” in the Company's Annual Report on Form 10-K filed with the SEC on December 10, 2009. You should not place undue reliance on the forward looking statements in this press release, and the Company disavows any obligation to update or supplement those statements in the event of any changes in the facts, circumstances, or expectations that underlie those statements. Copyright © 2009 ZOLL Medical Corporation. All rights reserved. 269 Mill Road, Chelmsford, MA 01824-4105. ZOLL and AED Plus are registered trademarks of ZOLL Medical Corporation.