The first alarm, a Genesis horn, is OK, but it does have some small issues
I’d rather go with the System Sensor MHR horn.
I will assume based on the fact that you have $30 + shipping to spend, would you like to buy one of my Mystery Boxes for $38? (That’s $25 for the box and $13 for the shipping)
More info here: https://forums.thefirepanel.com/viewtopic.php?f=5&t=6463
TomsAlarms, dont forget that there are other places on the internet where you can buy the same alarms but much cheeper. I recommend for now you to buy one of Andrews (The dude above this post) mystery boxes, as it will provide you with more than one alarm.
We’ll it is 2 wire so that’s one issue but for a little more money you will get more alarms and they will be in better condition then some of the ones on eBay. I have used Andrews videos to help my dad install lots of panels and alarms because of what Andrew taught me so he’s reliable too.
As well, to change the coding to the alarm, you have to physically break off tabs on the alarm, and once you do that the alarm is stuck in the permanent coding.