Item was exactly what I needed. I had previously purchased "Make Up Mirror LED Lights for Vanity Mirror" and I had skimped on the dimmer option. Well, lights were too bright and I wanted the option to dim. I contacted the seller who sent me the link to this dimmer. Received the package WITH INSTRUCTIONS and proceeded to follow the instructions.Installing the dinner was very simple and easy. It took me like 3 mins to install them. The instructions are in a diagram and are in my opinion very easy to follow with very very basic understanding of electrify/cords. The people complaining about this product I believe probably purchased the wrong item for their needs and instead of blaming themselves, they are blaming the product/seller.For installation all you need is a Phillips small flat head screw driver.Lastly, I used a 3M command (double sided) tape to mount the dimmer onto the side of my mirror. Just remember to have it where you can reach t easily and ensure that there's enough slack on the cable for moving parts.