Brand: LedgebitFeatures: AJ-765 WiFi Smoke Detector, Interconnected 360° Sensing Fire APP Remote Alarm Usage: Office Buildings, Industrial Premises RF433mhz Wireless and WIFI Interconnected Interconnected with Heat detectors, CO alarms, Remote,siren. DC3Volt battery 10 years lifespan TUYA smart mobile application CE EN14604/AS3786 ROSH listed Working Temperature -10℃~+50℃ Wireless Signal 433.92Mhz Package..