wifi+wireless interconnected smoke detectors (SR-851WI)

This new type of SR-851W(I) smoke detector is a smart wifi+interconnected detector. It can use wifi to connect to tuya or smart home APP to control fire safety with a smartphone. Meantime, it can be connect 20 pcs detectors which can display in the smart home or tuya app. Keep you away from the fire danger anytime, anywhere. More detail;https://www.firealarmfactory.com/wireless-interconnected-smoke-detectors.html