Win speed & temperature measurement. Measure wind speed in: Current/Average/Max. Wind-speed measurements in mph, km/h, m/s, f/m or knots Low battery warning Auto power OFF (Auto shut off in 50 second). Sapphire jewel bearing mounted impeller Waterproof & Weather Resistant This Anemometer is a wonderful gift for a wind sport enthusiasts! Applications include: Weather observation, fire and rescue services, construction, agricultural, forestry, aviation, boating, automotive, military, mining, sports, recreation, scientific research, educational, industrial and many more. Specification: Battery: CR2032 3.0V (included) Thermometer: NTC Thermometer Operating Temperature: --10C~+45C (14F~113F). Operating Humidity: 90%RH Store Temperature: -40C~+60C (-40F~140F). Current Consumption: About 3mA 1x Precision Anemometer1x Detachable Neck-Strap1x CR2032 Lithium Battery (Replaceable)