High alarm 85dB(3m),certified smoke detector with Low battery alarm,2-wire without polarity

Shenzhen Golden Security Technology Co., Ltd. was established in 2011, and is a professional manufacturer of security systems.Main products line as below, 1. Wi-Fi alarm systems, GSM+ Wi-Fi alarm systems, GPRS alarm systems, 3G alarm system. 2.GSM alarm systems, PSTN alarm systems, GSM+PSTN alarm systems. 3. Independent smoke detectors, Wireless smoke detectors 4. Gas leakage sensors, CO leakage sensors. 5.Alarm accessories, like door contacts, PIR motion sensors, water le...