Tuya ZigBee T&H&Siren 2-IN-1 Sensor:Detecting in the environment in time. Siren alarm louder than 90DB.Alarm Notifications:Smart phone will 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-180uAUSB port:5V/1ASound intensity:90dbDetection temperature:-10-80Detection humidity:0%-100%Wireless frequency:2. 4GHZCommunication protocol:Zigbee 3.0Wireless standard:Zigbee IEEE 802.15.4Wireless range:40MColour:WhiteMaterial:plasticPackage Contents:1 * Siren 2-in-1 SensorOnly 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.