That’s my first bell. The button on the other hand I’m not sure what it is. Found a few of them.Nice Bell.....I'm jealous of those.....12 years ago I bought my first detector, went to a park and immediately found one. I gave it away for some reason, I thought "Aahhhh its just a crappy bell"
I got another detector when Covid landed and have not uncovered another one despite digging lots of holes!