Xiaomi Mi Home Temperature and Humidity Monitor.

Home temperature and hygrometer data can be clearly read from the LED digital display in various brightness and angle.
High sensitivity and accurate sensor from Switzerland, senses subtle change of temperature and humidity.
Low consumption screen, a CR2032 button battery for one-year
Built-in advanced Sensirion temperature and humidity sensor, temperature accuracy: 0.1 degrees, humidity accuracy: 0.1 percent RH
Via Mi app to switch on humidifier when indoor humidity is too low and air-conditioner when indoors temperature is too high
 
This Xiaomi temperature and humidity meter does not have WiFi , being necessary to be close to it, in order to download the information to your smartphone.
 
Product Description
Name: Mi Temperature And Humidity Monitor 2
Model: LYWSD03MMC
Materials: ABS & PMMA Operating Voltage: DC 2.5-3 V
Wireless Connectivity: Bluetooth 4.2 Bluetooth Low Energy Frequency
Range: 2402MHz-2480MHz
Maximum Output Power: 4.16dBm
Temperature Range: 0 ℃ to 60 ℃
Net Weight: 18 g