The Shenzhen Welldone Tech & Industry Co., Ltd. of China is a technical enterprise which mainly deals in short-range wireless communication and residential security products. The up to date patent product to which we devote ourselves and launched into the market recently is wireless talking doorbell (wireless gate pass), which is designed specially for modern residents and office building consumers and which has the integrated functions with wireless doorbell, wireless talking and door remote-control etc. This new product reflects the design idea of technology and humanization and will take the lead in trendsetting of future consumption for household wireless products.