This product is a temperature and humidity detector with a 2.9-inch LCD screen and smart backlight function, which can display the current temperature, humidity, brightness, time, and date. Features: 1. Temperature & Humidity Detector: The product can measure temperature (-19~60 / -2.2~140F) and humidity (0~100%RH) in real time, and supports /F unit conversion. 2. APP Control: The upper and lower limits of temperature and humidity can be set through the mobile phone APP, and the alarm will be issued immediately after exceeding. You can also view historical temperature, humidity, and brightness data. It is compatible with SmartAPP and Smart Life APP. 3. Large LCD Screen: The 2.9-inch LCD screen can display temperature, humidity, brightness, time, date, remaining power, which is clear and easy to read. 4. Use Anywhere: It comes with a 3.7V 500mAh battery, which is charged with a USB cable. You can place it by your bed, desk, or hang it on the wall. 5. External Temperature probe: Accurately sense outdoor temperature, not only can measure outdoor ambient temperature, but also water temperature, refrigerator temperature, etc. ( Only Type 1 includes temperature probe. ) Note: 1. Due to manual measurement, the size may be slightly different. Thank you for your understanding. 2. Due to different light conditions and different monitors, item color displayed in photos may be showing slightly different from real object. Specifications: Type: with Temperature Probe (Type 1), without Temperature Probe (Type 2) -- Optional Color: White Shell Material: ABS Display: 2.9-inch LCD Screen Wi-Fi: IEEE 802.11 b/n/g 2.4GHz Working Voltage: 5V Quiescent Current: 30mA Temperature Measurement Range: -19~60 (-2.2~140F), 0.3 Humidity Measurement Range: 0~100%RH, 2% Brightness Measurement Range: 0~100% Battery:Built-in 3.7V / 500mAhLithium Battery Item Size: 8.6*8.6*2.3cm / 3.39*3.39*0.9in Packing Size: 10.5*10.5*2.7cm / 4.13*4.13*1.06in Packing Weight: 150g / 5.29oz ( with Temperature Probe ), 200g / 7.05oz( without Temperature Probe ) Package List: 1 * Temperature and Humidity Meter 1 * Manual ( English )