Review on 🔴 Twidec/16MM Raised Speaker Horn Momentary Push Button Switch with Red LED Light - 5/8" Mounting Hole, 12V, Black Stainless Steel Shell - Ideal for Car Modification (BKG16LB-R) by Jason Wesley

Looks like a good quality button. One of the photos in the listing shows 2 buttons (one larger, one smaller). I received a smaller one. I bought this to add a loud trucker horn to my fiancé's little Honda Civic. I kept the factory beep for normal use but added a loud beep for "special circumstances" 😂 This button is for the second beep. As mentioned, the instructions on the photos and their videos are definitely quite confusing, but I figured it out for my purposes and drew a better diagram/guide for those who might need help with the installation. The left and right terminals on the button are just power and ground for the light. Left = ignition plus, right = minus/ground. I chose "always on" for key highlighting. Found a positive terminal on the dashboard that burned out only when the ignition was on or the engine was on. And then I grounded the right terminal @ to metal somewhere in the dash. The function of the switch is the bottom and middle connection. The bottom one is the input for the switch (my 2 photos/drawings show the positive contact of the bottom switch in one picture and the negative contact in the other picture). The center connector is what connects to your horn/device (or relay). Press whatever key you put on the "C" terminal (bottom terminal / "3" in my picture), it will send it out from the middle terminal. Ground/minus to bottom terminal. But if the plus switched, put a plus on the bottom terminal. In my drawings I just used a standard 12 volt 4 pin relay. Pins 85/86 are the positive and negative switches. It doesn't matter what is positive or negative on these two terminals of the relay. (I won't go into the relay wiring, but there's plenty of info on google or youtube to figure this out.) One final note: I wired this up and provided diagrams of how I use it. The light is always "on" + "normally open" - meaning that when you press the button, the bottom port is closed/connected to the middle port. Anything connected to the middle port will receive anything you put on the bottom port. Hope this helps you all. The button seems nice, a bit small, but it works fine once you figure out the wiring.