The Scarlet WL-21 Wireless Wind Speed and Direction Data Logger has the following features:● Max 500m ultra-long wireless transceiver● Audible & visual wind speed alarm● Data recording up to 1 year● Wind speed, wind direction, temperature, air pressure measurements● Max 3 years sensor battery life● IP67 waterproof & impact resistant● Fast & secure magnetic installation kit Functions ● Instant Wind Speed AlarmWL-21 displays the live wind speed value in selectable measurement units (m/s, knots, MPH, km/hr). Users can set a wind speed warning limit based on local operation safety standards. An audible and visual alarm will be triggered when the limit has been reached. Each sensor has a unique wireless address that can connect to several displays to notify multiple stakeholders on-site. ● Data RecordingWL-21 captures and stores wind speed, direction, temperature, and air pressure measurements. 64MB built-in memory and outstanding battery life support up to 1 year of continuous data recording. (based on 10s logging interval, adjustable: 2s, 5s, 10s, 1min, 5 mins, 10 mins, 60 mins). The recorded data can be easily exported in Excel format for further analysis. ● Graphical DisplayThe large LCD backlit display with a user-friendly interface indicates live weather data in various units of measurement. Users can view hourly wind records and historical bar charts from the past 12 hours on different pages.