The package does not contain batteries Perpetual calendar, clock function, 12/24 hour conversion Temperature Switching: Fahrenheit/Celsius to Fahrenheit/Celsius Temperature detection function: The temperature range is -9.9Celsius~60Celsius (14.18Fahrenheit~140Fahrenheit), the error is 1Celsius, the accuracy is 0.1Celsius, and the detection period is 10 seconds. Humidity measurement range: 0% ~ 99%RH, error 5%rh, accuracy 1%, detection cycle 10 seconds. Color automatic ambient climate reminder: 1. Dry: Humidity is less than 29%, (0%-10%, 11%-20%, 21%-29% in total three gears), display DRY 2. Comfort: When the humidity is between 30% and 69%, (30%-39%, 40%-60%, 61%-69% in three gears), the COMFORT will be displayed 3. Humidity: When the humidity is or equal to 70%~99%, (70%-79%, 80%-89%, 90%-99% in total three gears), the WET will be displayed Temperature and humidity memory function: record the maximum and minimum temperature and humidity Backlight touch key: turn on the backlight for 15 seconds and automatically turn off Battery level display, 2.6V, low battery level display Each Thermometer Humidity Meter Power supply: 2 X AAA batteries (not included) Colour:White Material:plastic Package Contents: 2 x Thermometer Humidity Meter 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.