APP ControlTrigger alarm; Make sound and light; Remote on/off via APP. Siren alarm louder than 90DB. ALARM NOTIFICATIONSSmart phone will get instant notifications when siren alarm triggered and check the log on APP. Widely used in home, kitchen,office, etc. EASY TO SETUPSiren with humidity and temperature sensor; Set the temperature and humidity alarm range that automatically alarms. MEMORY FUNCTIONAutomatically restore the previous settings with memory function when network or power off reconnecting. FAST RESPONSEUltra-fast response, -interference ability, ultra-low power consumption and cost-effective. Supporting 5V 1A USB port power.. Specification: Type: Temperature Humidity Sensor Material: Plastic Color: White Size(L*W*H): About 68x68x33mm/2.68x2.68x1.3inch Power By: Battery*2 3V (not included) USB Power Supply: 5V/1A Volume: 90db Working Temperature: 0 40 (32F104F) Working Humidity: 20% 85% Wireless Frequency: 2.4GHz Network Range: About 40m Wireless Protocol : Zigbee 3.0 IEEE 802.15.4 Package: 1pc x Temperature Humidity Sensor 1set x Sticker 1bag x Screw 1pc x USB Cable 1pc x English Manual Note: 1. Due to the light and screen difference, the items color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.