1. [Wifi + Bluetooth dual mode]: Connect to faster. connection speed is 2 times faster than Wifi only 2. [High and low temperature alarm]: Once the set temperature value is exceeded, the phone will prompt an alarm 3. [High humidity and low humidity alarm]: Once the set humidity value is exceeded, the phone will prompt an alarm 4. [Real-time monitoring]: Battery power supply AAA1.5V*2 (excluding batteries), low power consumption, according to the system default settings, it can be used for about 1 year.Data update frequency 1-120 minutes, you can choose the update frequency as needed. The smaller the value, the shorter the actual battery life 5. [Temperature and humidity curve]: Record temperature and humidity changes on the APP and present them to you with graphics. Let you know the recent data changes more intuitively 6. [Temperature unit switch}: The sensor is designed with Celsius and Fahrenheit temperature conversion functions. You can select the unit to be displayed as needed. 7. [ voice support]: The sensor supports Alexa and Home Assistant. You can hear the current temperature and humidity through voice. Power supply: AAA1.5V*2 (battery not included) Wi-Fi support: 2.4G IEEE 802.11 b/g Temperature measurement range: -10~55 Temperature accuracy: 0.3 Humidity measurement range: 10percent ~99percent RH Humidity accuracy: 3percent RH Colour:Black Material:plastic Package Contents: 1 x Wireless Temperature and Humidity 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.