Review on Pack of 5 Metal Latching Push Button Switches - 16mm with Blue LED Light - 12V/24V DC by Andrew Enriquez

They work great, I used them to make front high beam headlights 'always on' on my 70's car but I can still turn them off. A glowing indicator shows me the status. The instructions go against common standards, showing the battery as a load device and causing me to miswire the first switch I set up. I had to look closely at the drawing to see what they were doing. The usual standard for wiring drawings is that the battery is the power source and the light bulb is usually the load device. I have no idea what "sharpness" means.