This is Anna Yuan come from China. I am one of the oversea sales in Shenzhen Golden Security Technology CO.,Ltd and I have worked in Golden Security for more than three years. 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 PIR motion sensor, Zig-bee door/window contact, Zig-bee Smart water leakage sensor , Zig-bee Smart Power socket .4. Z-wave Home automation accessories like Z-wave Smart door/window contact, Z-wave PIR motion sensor, Z-wave door/window contact, Z-wave Smart water leakage sensor , Z-wave Smart Power socket .5. fingerprint lock and wireless home doorbell. Golden Security can provide OEM/ODM service as we have a powerful engineer team including firmware engineers, server engineers, hardware engineers, iOS APP engineer, Android APP engineer , can customize specific functions and design product appearance & structure as partners require , and can also provide product solutions for distributors to develop and grow their local market share.If you have any need, you may leave message or contact me.Mobile/Wechat/WhatsApp: +8613823349639 Skype: anna-security