The Temperature and Humidity Sensor is designed for use with RV Whisper Monitoring Station (sold separately). Up to 10 Bluetooth Temperature and Humidity sensors can be used with one RV Whisper Monitoring Station. Common uses are tracking inside, refrigerator, freezer, outdoor, and wet bay temperatures. With the included Temperature and Humidity sensor, you can: * Track temperature and humidity at your RV, inside, outside, in your refrigerator and more. * Add up to 10 temperature sensors to your RV Whisper Monitoring Station