1. Indoor and outdoor temperature display (℃/℉) 2. Indoor and outdoor humidity display 3. Record the maximum/minimum temperature and humidity; 4. Comfort switch window guidance There are hook holes and brackets on the back, which can be wall-mounted or used standing. 5. Low battery indicator icon: Press the top button and the white backlight will last for 5 seconds;<br><br>Indoor temperature measurement range: -10℃ to 50℃ Outdoor temperature measurement range: -20℃ to 65℃ Indoor humidity measurement range: 20% to 95%RH Outdoor humidity measurement range: 1% to 99%RH Effective sensor connection distance: 80 meters in open environment Colour:black+white Material:ABS<br><br>Package Contents: 1 x Temperature And Humidity Sensor (3 AAA batteries not included in delivery) 1 x Transmitter (2 AA batteries not included in delivery) 1 x Multilingual instructions<br><br>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.