Beijing Ruidefuan Technology CO., LTD.(be called RDFA), established in 2004, is one of leading company in China specializing in light bars, sirens and speaker etc. RDFA is one of the biggest manufacturer for warning light bars, siren and speakers in China, and has supplied specialist equipment to over 10 province in China, as well as being a major supplier to Chinese government organizations. Some products have been offered to clients from all over the world. We can design and manufacture warning light bars, siren and speakers according to your requirements.