Skywatch Explorer 4 Windmeter
Dimensions : 41 x 93 x 17 mm
Weight : 50 grammes
Backlight
Precision : +/- 3 %
5 measurement units : km/h, mph, knots, m/s and fps
3 wind measurement modes : instant, maximum and average
Replacement Lithium Battery
Waterproof
Operation Temperature -20°C to 70°C (-4°F to 158°F)