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D1D9 Home Alarm System Touch Screen Burglar House Security 18 Pcs Wifi App Diy Wireless GsmAbout us: Our company is based in Shenzhen, China. The brand is D1D9. In 2008, we began designing and making house alarm systems and smart products. D1D9 have a full range in home smart products. In 2015, the company is SHENZHEN CHAMBER OF E- BUSINESS, vice p..