Shenzhen Joy Technology Co., Ltd. established in 1998, we are engaged in elder alarm telephone,home security products innovation, design, development and OEM / ODM all along.We are one of industry standard upgrade and innovation solution offer supplier in this domain. We have a solid experience engineering R/D team,and keep on upgrade and improve performance and function to fit new demand from marketing.Our Key shareholders have strong engineering design background, they came from top 500 ...