12 years ago, delta security was only a work studio in Hua qiang bei. We designed the circuit and programmed the console of home alarm system for local factories. At end of year 2010, we manufactured our first home alarm system, 10A, which won great reputation from the market. And a lot of local brand came to us and asked for private branding. In 2018, we developed new 4G series products including 4G alarm system, 4G routers and 4G solar cameras...