- Built-in upgraded MEMS sensor, refreshes once per second to provide timely and high accuracy data. Temperature error up to 0.5℃, Humidity error up to 5%. - Adopted 5.0 Bluetooth chip, provides real-time wireless monitoring for temperature (-20-60℃) and humidity (0-100%RH). - 50m(164ft) connecting distance (in open area). - Temperature sensor uploads data to App when connected via Bluetooth. You can check the maximum and minimum values of temperature and humidity on the APP. One smart device can be connected to up to 100 temperature sensors simultaneously, supports Android 4.3 or above, iPhone 4s or above. - Data on the APP will turn red and send a notification to your mobile phone to remind you and your family of temperature and humidity variations when data exceeds your pre-set value. - Applicable scenarios: home, pets, refrigerators, freezers, walk-in coolers, wine cellars and greenhouses monitoring. - Wireless thermometer hygrometer records data every 10 seconds in the APP, total storage up to 100 days. (Please make sure that your phone gets within its range at least once per day.) - Data in CSV format is available to download for free after account registration. - Dimension: 1.5 x 1.5 x 0.62 inches, weight: about 1.3 ounces per unit. - Built-in CR2477 battery, battery lifespan is about 10 months. - Designed with a hanging hole for various placement options.