Shenzhen Welldone Technology and Industry Co., Ltd. of China is a leading manufacturer and exporter of wireless doorphone and wireless intercom access control system in China. We mainly focus on short-range wireless communication and residential security products. The patent products of wireless door phone and wireless intercom access control system are designed specially for modern residents and office building consumers. They have the integrated functions with wireless intercom and door remotely opening. These new products reflect the design idea of technology and humanization. They will take the lead in trendsetting of future consumption for household wireless products.