AcuRite 06002M Wireless Temperature and Humidity Sensor Wireless, weather-resistant sensor measures temperature and humidity Sensor data is transmitted every 16 seconds using 433 MHz wireless signal up to 330 foot (100 meter) range Requires 2 AA alkaline or lithium batteries (Batteries not included). Temperature Accuracy - +/- 2 degrees Fahrenheit Easy installation includes integrated hanger The sensor is compatible with the AcuRite Access and a variety of AcuRite thermometers and weather stations