AcuRite 3N1TXC 3-in-1 Wireless Weather Sensor with Wind Speed, Temperature and Humidity High-precision 3-in-1 wireless weather sensor accurately measures the temperature, humidity, and wind speed Sensor data is transmitted every 18 seconds using 433 MHz wireless signal up to 330 foot (100 meter) range Requires 4 AA alkaline or lithium batteries; lithium batteries recommended for -4 degrees Fahrenheit/-20 degrees Celsius or below (not included) Easy setup includes mounting hardware Compatible with AcuRite smartHUB (sold separately) and AcuRite 3-in-1 weather station displays (sold separately; full list below)