Fangrui Product Details Snzb-02d Is A Zigbee Temperature And Humidity Sensor, To Monitor Your Homes Temperature And Humidity For A Comfortable Life, And There Are Icons To Indicate Hot/cold/dry/wet Air Conditions, Reminding You To Adjust Your Humidifier Or Dehumidifier Accordingly To Achieve Optimal Comfort, Also Power Icons To Know The Current Power Usage The High Accuracy Built-in -made Sensor Ensures Accurate Measurement Of Room Temperature And Humidity, The Temperature Is Accurate Up To 0.2while The Humidity Is Rh, Data Is Updated Every 5s, Gives You The Latest Changes In The Environment. The Snzb-02d Sensor Supports App Monitoring, You Can Not Only Check The Current Temperature Humidity On The Lcd Display, But Also Track The Real-time And Historic Temperature Or Humidity Data Via The App On Your Phone, With Up To 120m/400ft Coverage (no Obstructions And Conditions), You Can Check The Latest Data At Any Time, And Once The Temperature Or Humidity Exceeds The Preset Range, You Receive An Instant Alert