we are glad to take this opportunity to introduce our company as a leading manufacturer of  wireless video door phone system  such as the first manufacturer owning this technology in China (world-leading technology, exclusive patent tent product). The product has broken off the distribution limit of the original model and has opened a new home-appliance market opportunity. With the products in excellent quality, full variety, stability and best service etc., the company has constructed a mature domestic and overseas sales distribution web and has ranked itself as one of the biggest manufacturers in security field in China.. Hoping to establish business relationship with your esteemed company in the near future.