Very good light - but to turn slightly

The rear light is very small, light and easy to mount => therefore ideal for biking => which would be 5 star.
But: the power button located at the bottom center, is operated by simply pressing. This can not exclude you sure that the rear light, for example stays out in the backpack when it stowed something else, looking ... => was with us the result that we were able to just enjoy the first real use short; the battery freshly inserted at the beginning of the multi-day tour were empty => 2 star deduction.