Kestrel Shooters Weather Meter with Horus Ballistics Rugged all-in-one weather meter and ballistics calculator designed for military, hunting and competitive long range shooters, with Blue Tooth Measures and records current/average/maximum wind speeds, cross/tail wind, temperature, humidity, compass heading, density altitude, dew point, wind chill, pressure, altitude Get integrated aiming solutions and comprehensive environmental data in one unit with Horus Atrag targeting solutions (2500 data-point memory) Protective flip-open impeller cover, replaceable impeller, large backlit LCD, waterproof, drop tested, accurate NIST-Traceable measurements, Bluetooth wireless data transfer and Night Vision Preserving Backlight optional 4.8 x 1.9 x 1.1 in., 3.6 oz., includes replaceable CR2032 coin cell battery, lanyard; Made in USA and backed by a 5-year warranty