3 cups mounted on rotor, allow the reading of wind speed in all Waterproof and insubmersible.
Automatic backlighting in low light conditions. Automatic OFF switch 60 seconds after cups have stopped rotating (allows battery saving).
Dimensions : height 135 mm, Ø 7 cm (cups included).
Weight : 70 g with battery.
Power : 1 x 3 V lithium battery. CR2032 type.
Battery lifetime : 8000 hours (up to 10 years), 100 hours with backlighting.