Perimeter alarm will activate the alarm if the hood doors or trunk is open when the alarm is set. Panic loves you to press and hold the headlight button on your remote for three seconds in your horn supposed to beep but on my car even though I had it enabled, it wouldn’t work. Security sounder is a separate little horn that’s in the engine compartment or wheel wells or something that makes noises under various conditions. I can’t explain I don’t have it.