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.