The attachment means of removable, adhesive was smooth and easy, and can even be made to a trace wallpaper reversed with some caution.
The brightness in my opinion is enormous and absolutely sufficient (is used with me in the hallway).
Equipped with 3 cordless batteries (AAA), the battery approximately every 9-10 weeks is due.
A star I have to deduct because of Nightlux has given up the ghost after just 25 months. The light reacts regardless of setting, movement or brightness permanently and no longer switches off. It is no longer usable. With the currently low price of 7.99 but you can easily replace it.