This is a replacement outdoor sensor for Geevon wireless weather station and indoor outdoor digital therometer hygrometer. Please notice that it can not be connect to the weather stations of other brands, so please verify your product is compatible with it before purchasing. [ Features of Wireless Outdoor Remote Sensor ] This is a replacement/supplement sensor for Geevon Weather Stations & Indoor Outdoor Therometers. It measures the outdoor temperature and humidity with sensitive vents and requires 2 AAA batteries. [ 200Ft/60m Transmission Range] Sensor data is transmitted every 30 seconds using 433 MHz wireless signal up to 200 feet (60 meter) range. It covers outdoor areas such as balcony, courtyard, garden, garage and for different public places: camp of the hospital, etc. [ Monitoring Temperature and Humidity of Different Locations ] Insert 2 AAA batteries and select the desired channel(1, 2 or 3), the transmitter will start working automatically. The weather station will display the temperature and humidity for 3 different locations with 3 sensors. [ Useful Tips ] In order to get an accurate reading, please place the sensor device in a ventilated environment, avoiding direct sunlight or nearing the heat / moisture sources. [ Important Note ] The TX19 sensors are compatible with Model 8646/23190/8688/8667/86258/86250/86268/86297/86275/86300/8614/86282/86278/86281 Weather Station Thermometers.