We are a big powerful manufacturer specialized in producing 6'' 8'' 10'' DC12V/24V,AC120V/220V, indoor/outdoor fire alarm bell. We design and produce ourselves, so we can offer OEM service. We have established regular relationship with many foreign firefighting companies. All our fire alarm bells are in excellent quality with first-rank materials and thus always pass CE and UL test in the clients' countries every time. We also have ourown brand CHAOYI.  Please feel free to let me know, if you are iterested in our products and servie.