The image above is the reference information to the inside of Everspring siren and I’m pointing to the section regarding the top jumper which controls the option listed in the reference for audio. So all it means is if the jumper is on the two pins that are covered then the audio is set to High (100db). If the jumper is taken off then it’s set to low (90db).
Here’s a image of what it looks like when both jumpers are taken off.
Before you decided to make this change please follow the simple instructions.
1) Take out all batteries.
2) Take out or put in the jumpers for the desire option
3) Place batteries back in.