Timrå is a municipality in northern Sweden, in the county of Västernorrland. The municipality covers an area of 787.0 km². Of the total population of 17988, 9120 are male, and 8868 are female. The population density of the community is 23 inhabitants per km².
... devices come with electronic rev counters and light emitting diodes powered by a little generator embedded in the gyroscope.
The physics of this device look ...