The Weather at Home EMR211 combines a wireless indoor / outdoor thermometer with the latest Bluetooth technology allowing you to monitor your local temperature on your smart phone or tablet as well as station itself. The Ice Alert feature notifies you when temperatures are near freezing. The associated smartphone app shows the temperature in up to 5 locations with a 7-day history and a data logger. The Weather at Home range supports up to 5 sensors. Pair it with additional THN132 sensors and BTHGN129. Transmission range up to 150 ft.