Wireless Anemometer: Measures wind direction, wind speed, wind gust, UV & light data[Accessory Only, Can Not Be Used Alone] | Live Data on APP: requires a GW1000 WIFI gateway(sold separately) to connect to WiFi, the live wind, UV & light data can be viewed directly on the WS View App after the WIFI configuration; supports uploading to our free Ecowitt Weather server(ecowitt.net) to view the sensor data graph and download the history records on the website; it's recommended to add a shortcut of the website on the home screen of your phone for quick access | Remote Monitoring: Supports uploads to WU/WeatherCloud/WOW. The history graph of your WU station ID can be viewed on the WU Dashboard on the WS View App | Long Transmission Range : the sensor data is transmitted every 16.5 second using 915 MHz wireless signal up to 300 feet (100 meter) range; solar powered outdoor sensor and needs 1 AA battery(not included) as backup power | Works with HP3501 Weather Station display console(sold separately). The sensor and display console should be at the same frequency