The Key Hook has many different applications and is easy to install on any light switch. I personally use it for my mask at home and I have not lost my mask since. Depending on the length of your light switch screw you may need a longer 6-32 screw which are very cheap. Included is a G-code file for a variety of 3d printers if you would like to make one at home. Enjoy and email me with any questions and concerns 3dprintz40@gmail.com