SECURITY DEVICES INTERNATIONAL

PRESS RELEASE

August 28, 2013

Security Devices International Inc. Announces Completion of IPO

TORONTO, August 28, 2013 - Security Devices International Inc. (“SDI”), a defense technology company specializing in the development of innovative, next generation non-lethal ammunition, announced today it has completed an initial public offering (the “Offering”) and that its common shares are expected to commence trading on the TSX Venture Exchange (“TSXV”) under the symbol “SDZ” on or about September 3, 2013. The Offering raised total gross proceeds of CDN$3,993,980 through SDI’s agent, Macquarie Private Wealth Inc. (the “Agent”).

On August 15, 2013, SDI filed an amended and restated final prospectus (the “Prospectus”) in the provinces of Alberta, British Columbia and Ontario, and had earlier received conditional approval to list its common shares (“Common Shares”) on the TSXV. A copy of the Prospectus can be viewed on SEDAR (www.sedar.com).

Pursuant to the Offering, SDI raised total gross proceeds of CDN$3,993,980 through the issuance of 9,984,950 Common Shares at a price of CDN$0.40 per Common Share (the “Issue Price”). A cash commission of CDN$359,458 was paid, and an option (the “Agent’s Option”) to purchase up to 898,645 Common Shares was issued to the Agent and members of its selling group. The Agent’s Option entitles the Agent and members of its selling group to purchase Common Shares at a price of CDN$0.40 per Common Share until August 27, 2015.

4,377,300 Common Shares held by principals of SDI prior to completion of the Offering will be held in escrow, 10% of such Common Shares will be released upon the Common Shares being listed on the TSXV and 15% every six months thereafter, subject to acceleration provisions provided for in National Policy 46-201. In addition, 3,500,000 Common Shares held by nonprincipals prior to completion of the Offering will be subject to resale restrictions imposed by the TSXV, all of which will be subject to the same release schedule noted above for principals. Upon completion of the Offering, $2,297,044 of convertible debentures (including $279,188 of interest) was converted to 2,213,711 Common Shares, resulting in the discharge of those debentures.

The holder of a bridge loan has exercised the holder’s right to convert that the principal and interest (totaling CDN$382,013.70) into common shares at CDN$0.2775 per share, resulting in the issuance of 1,376,625 common shares. SDI had expected to repay this loan out of the proceeds of the Offering.