Established in 2011,Shenzhen Golden Security Technology Co.,Ltd is a professional GSM/Wi-Fi alarm system and Wi-Fi/PSTN alarm system manufacturer.Product lines includes: 1.GSM alarm systems, GSM/Wi-Fi alarm system and Wi-Fi/PSTN alarm system used for D.I.Y home security.2.868mhz/433mhz alarm accessories like door/window contact, PIR motion sensor, Water leakage sensor, Smoke detector, gas leakage sensor .3. Zig-bee Home automation accessories like Zig-bee Smart door/window contact, Zig-bee PI...View More