Expressway is one of our common ways of traveling. However, have you ever thought about,for example, in the tunnel,what can be done if we encounter serious problems or emergencies ...
Changsha SPON Communication Technology Co., LTD was established in 2002 with over 20000 Square meter workplace . It is a national high-tech enterprise which has own core intellectual property and innovative research & development capabilities. We have rich experience in IP video and audio products and PA system products.