Addendum after 3 weeks:
In the woods on gravel the smallest level ranges in the front light to about 12 km / h from the bottom darker needs will be converted to stage 2. For faster journey I need the highest level. Rating remains at 4.5 *
The brightness of the tail light is good, the information about the battery status is great, do not have the cheap taillights.
Would not the set buy again.