1. Wireless Sensor & Distance Range: The indoor outdoor thermometer wireless includes a display host and 3 wireless remote sensors, which can accurately measure indoor and outdoor real-time temperature and humidity of different areas. These sensors can be installed and used within meters of the host without obstacles. It is widely used and is one of your best choices. 2.MAX & MIN Record & Widely Range: The thermometer hygrometer provides the historical temperatures Max/Min records in the past 24h or all time, as well as trend changes and comfort indications, freely convert /. In 3.Large Display & Backlight LCD Screen: The host has a LCD screen with a large font display, which displays the temperature and humidity monitored by the host and 3 transmitters. It also has a backlight function. There are 2 levels of backlight (semi-bright, full-bright) when the data line is powered, and only 1 level of backlight when the battery is powered. 4.Dual Mode Power Supply: The host has a dual power supply mode: batteries or data cable power supply. When using both the battery and the data cable for power supply, the data cable will be used first and the battery power will not be consumed. Each sensor needs to install batteries. When the battery is low, the host will display a low battery symbol on the corresponding channel. 5.The host has three placement methods: standing, magnetic and hanging. The three transmitters are equipped with lanyards and suction cups, so you can easily install them indoors or outdoors. You apply them to bedrooms, living rooms, baby rooms, kitchens, offices, gardens, warehouses, collection room, study room, humidor and library and other places. Package includes: 1* Host 3* Transmitters 1* Instrutions