HONGCHANG(CHANGZHOU) ELECTRONIC CO.,LTD as a professional High Quality 40mm 4ohm loudspeaker manufacturer and supplier in China, all the High Quality 40mm 4ohm loudspeaker have passed the international industry certification standards, and you can be completely assured of quality. If you do not find your own Intent High Quality 40mm 4ohm loudspeaker in our product list, you can also contact us, we can provide customized services.