1. Measuring indoor and outdoor temperature and humidity, Celsius and Fahrenheit conversion, maximum and minimum humidity memory function, can view historical temperature and humidity data 2. At most 3 outdoor units can be connected (one outdoor unit is equipped for conventional packaging) 3. Two high magnetic magnets on the back shell of the host can be adsorbed on metal objects 4. The back of the host is equipped with a bracket, which can stand in a horizontal position 5. High sensitivity touch key control, easy to operate Comfort indication, temperature and humidity trend indication HTN large screen HD color LCD display without viewing angle With backlight, the backlight be automatically turned off after 10 seconds without operation Outdoor unit can be hung by hanging hole or stand on horizontal plane Indoor temperature range: - 4F - 158F (- 20C - 70C) Outdoor temperature range: - 40F - 158F (- 40C-70C) Humidity range: 20percent - 95percent Comfort display: dry, comfortable and wet Temperature display unit: C or F Optional (default isC) Temperature resolution: 0.1C or F Humidity resolution: 1percent Refresh rate: 10 seconds. Error: temperature plus or minus 1 humidity plus or minus 5percent Wireless reception range: 60m or 197ft RF radio frequency: 433 MHz Power supply: Host 2xAAA (not included) transmitter 1xAAA (not included) Colour:White Material:plastic Package Contents: 1 x host (without 2xAAA batteries) 3 x transmitters (without 1xAAA battery) 1 x English instruction manual 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.