Kestrel weather meters are designed & manufactured in the u.S.A..They are innovatively designed for stability and accuracy in abrupt condition changes.Rugged and durable, kestrels' are drop tested, waterproof and designed to float if dropped in water.The kestrel 3500nv allows you to measure wind speed, temperature, relative humidity, dew point and wet bulb temperature with one instrument.Its dim red black-light won't reduce night vision when used in the dark plus data hold feature and clock.This meter is bluetooth compatible with ios/android up to 100 ft and includes a protective case and lanyard.Function: Measures WeatherRange: 100 ftBattery: CR2032Screen Type: LCD DisplayProofs: Waterproof/Shock ResistantBacklight: YesColor: OD GreenCompatible With: Windows/MAC