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Photoelectric smoke alarm does not contain the radioactive material which is harmless to the environment. The smoke and heat detector is a device used to detect smoke and heat. The device does not detect gas. The device is suitable for indoor use only. If the device detects smoke or heat, the alarm will sound and the LED indicator will flash red continuously until it is eliminated. Feature: 1.Wi-Fi protocol, can be added to TuyaSmart intelligent security system. 2.Wireless - Photoelectric smoke alarm device. 3.Low-Power feature, DC2*1.5V Alkaline AA battery. 4.At least one year battery service life. Specifications: 1.Power Source: DC2*1.5V Alkaline AA battery 2.Wireless frequency: 433MHz 3.Quiescent Current: ≤4μA 4.RF Receiver: 85dB(A) @ 3 meters 11.Low Voltage Threshold: DC 2.6-2.8V 12.Battery service life: >1 year 13.Humidity Range: < 95% relative humidity (RH) 14.Temperature Range: 0℃ to 40℃ 15.Size: 120mm in diameter x 35.5mm depth