Feature Can display three channels and indoor temperature and humidity at the same time,showing the comfort level of the three-level indoor environment Indoor temperature,test range 0--50C,outdoor temperature,test range -50C-70C .Indoor and outdoor humidity detection range: 2099 Indoor and outdoor temperature indication and humidity change trend. Record the highestlowest indoor and outdoor temperature and humidity When the temperature and humidity upper limit alarms,the backlight will also turn oranges,and when the lower limit alarms,the backlight will also turn red,accompanied by an alarm sound.This function has a practical invention patent Temperature and humidity calibration function time and date display Notice: Actual color may be slightly different from the image due to different light effect Please allow 1-3cm deviation due to manual measurement Net weight: 267g Gross weight: 380g Size: 12.5*2*12.5cm Accessories list: temperature and humidity meter*1,outdoor unit*3,outdoor unit base*3,USB cable*1,Chinese and English manual*1 Power supply mode: AAA battery *3 or DC 5V power supply shipment without battery Material: ABS Package List: 1 Set Wireless Indoor Outdoor Thermometers