Tuya ZigBee T&H&Siren 2-IN-1 Sensor:Detecting in the environment in time. Siren alarm louder than 90DB. Alarm Notifications:Smart phone get instant notifications when siren alarm triggered and check the log on APP. Widely used in home, kitchen,office, etc. Smart Scenarios:It can also be combined with other smart WIFI products based on Tuya to design and implement smart application scenarios. Ultra-fast response, anti-interference ability, ultra-low power consumption and cost-effective. Supporting 5V 1A USB port power. Standby current:61uA-180uA USB port:5V/1A Sound intensity:90db Detection temperature:-10℃-80℃ Detection humidity:0%-100% Wireless frequency:2. 4GHZ Communication protocol:Zigbee 3.0 Wireless standard:Zigbee IEEE 802.15.4 Wireless range:40M Colour:White Material:plastic Package Contents: 3 x Siren 2-in-1 Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.