It is for when you don´t have a night stand and no place to put your glasses. You just clip it on head board of your bed and that is it.

It is designed for board thickness of 18-22mm (0,7inch-0,86inch), but if you need to adjust it to different dimension, just write me a message and I will send you an updated clip.

Design consists of two parts: box and clip, which they just snap together.