Features: Upgraded 3 Wireless Sensors Thermo-hygrometer- Capable of displaying the readings from up to 3 outdoor remote sensors to monitor multiple locations, which will be cycle displayed every 5s. Equipped with 4.0" LARGE SCREEN, it displays indoor/outdoor temperature and humidity, Max/Min records of Temperature and humidity, arrows indicate trends in temperature and humidity and low battery indicator of indoor and outdoor . 4 High Sensitivity Touch Buttons-Light up the Backlight (Auto off within 10s to save energy) Read the temperature and humidity from one of 3 channels / Re-synchronize or re-pair the units Check the temperature and humidity in the past or last 24 hours / Switch or View the Max/Min records and clear data . High Reliability & Accuracy-Digital thermometer hygrometer equipped with multiple sensitive vents to give fast response every 10 seconds, provides daily health care aid for you and your family. Indoor temperature range: -20~70C, outdoor temperature range: -40C~70C, humidity range: 20%~95%, accuracy: 1C/ 5% . Multi-Mounting Options-Indoor hygrometer thermometer features tabletop, wall-mountable and magnet-mountable design. Outdoor sensor with hook up, wall hanger and retractable stand at the back, which is IPX4 WATERPROOF to hang in the tree or mount it on wall effortlessly. All powered by 2 AAA battery (Not included) . Package includes: 1* host 3* outdoor remote sensors 1*manual