Tuya Smart Home WIFI Temperature Humidity Sensor Alarm Indoor Outdoor Hygrometer Thermometer Detector Support Alexa Google Home Device firmware upgrade: the temperature probe can display decimal point (0.1C) Feature: 1.New Tuya WiFi Digital Display Temperature and Humidity Sensor, No Hub Required 2.The built-in high-precision digital sensor can quickly and accurately find the temperature and humidity changes 3.USB charging, no need for you to buy batteries, energy saving and money saving. 4.This Sensor has a temperature probe(optional), which can test Water temperature/fish tank, etc humidity exactly. It was used widely. 5.You can set the temperature and humidity to go online and offline, and alarm immediately when the temperature and humidity is exceeded. Specifications: Product name: WiFi Temperature & Humidity sensor Working humidity: 0~100%RH Working temperature: -19~60 Internal temperature accuracy: 0.3 Humidity measurement accuracy: 2% Brightness measurement range: 0~100% Working voltage: DC 5V Quiescent current: 30mA Battery Specifications: 3.7V/500mAh Charging time: 2 hours Built-in battery usage time: 4 hours (fully charged) Temperature probe: 1/2/3meter Wi-Fi standard: IEEE 802.11 b/n/g 2.4GHz Size: 86*86*22.8mm APP name: Tuya Smart or Smart Life Package Included: 1*Smart temperature and humidity sensor 1*User manual Notes: 1.Temperature probe cable cannot be used alone,cable error is 1 C. 2.The internal and external modes of the temperature sensor cannot be used at the same time. 3.After connecting the temperature sensing cable, you need to manually calibrate the temperature of the sensor yourself.