This speaker uses high-quality PVC plastic transparent film as drum paper, its characteristics of loud, high-pitched clear and strong, strong front waterproof. Is to do alarm amplifiers, anti-theft devices selected for electronic products. The company provides free sample testing, there are professional proofing r & D engineers, according to the map | Sample customization, own factory, quality and quantity! Regular proofing speed, welcome to consult and order! In order to adapt to the EU SGS, ROHS regulations, the company has fully implemented the environmentally friendly horn, that is, all electronic components to comply with environmental regulations. Will be in line with international standards, the first to sell to Europe and the United States.