For 40mm loudspeaker, everyone has different special concerns about it, and what we do is to maximize the product requirements of each customer, so the quality of our 40mm loudspeaker has been well received by many customers and enjoyed a good reputation in many countries. HONGCHANG(CHANGZHOU) ELECTRONIC CO.,LTD 40mm loudspeaker have characteristic design & practical performance & competitive price, for more information on the 40mm loudspeaker, please feel free to contact us.