Our company, NINGBO WANMING ELECTRONICS CO.,LTD, specializes in the producing and dealing with the SIREN which are widely used in the security system. The products covered four main categories: Horn Speaker, Electronic Siren, Battery Back-up Siren and Piezo Siren. Every category includes different sizes. The different sizes in different categories can meet different customer?s inquiry. More information, please visit our web site: . If you are interested in our products, please contact us immediately without any hesitation.