[Displayed on the same screen] The 4.6 inch backlit LCD screen has huge digits for you to view data clearly: temperature and humidity monitored by the host and 3 sensors, trend and comfort. You can easily understand the current changes in the surrounding environment. Freely switch /. USB power supply: 2 backlight levels (semi-bright, full-bright), Battery power supply: fixed backlight. [Real-time monitoring] The measurement range of this digital thermometer and hygrometer: indoor temperature (-20-70C); outdoor temperature (-50C-70C); humidity (10%-99%). Accuracy is 1(2)/5%. It will record temperature and humidity over time and provide you with the Max/Min data of temperature and humidity for the past 24 hours or all past periods, so that you can know their changes at any time. br>[3 Sensors & Wide Range] This combination wireless thermometer and hygrometer is equipped with 3 wireless remote sensors plus a host, which can accurately measure indoor and outdoor temperature and humidity. The sensor can be installed and used within 100 meters of the host without obstacles. They will transmit the data to the host so you can see at a glance. [Dual power supply] The host has 2 power supply modes, 3 AA batteries only or data line power supply . When the battery and data line supply power at the same time, the data line will be preferentially used for power supply without consuming battery power. Each sensor needs to install 2 AAA batteries. When the battery is low, the host will display a low battery symbol on the corresponding channel. [Wide Application] The main unit of this home thermometer and hygrometer can be placed in 3 ways: upright, magnetic and hanging. Each transmitter is equipped with a lanyard and a suction cup, you can easily install it indoors or outdoors. You install them in the bedroom, living room, baby room, kitchen, office, garden, warehouse and other places.