A false alarm caused by a dusty detector set of Edwards 892-1Bs about an hour before the church service started. About 20 of us were there to set up early in the morning. Here is the video:
And for those who may not know, here is a picture of an Edwards 892-1B:
May as well ask, what kind of detector was it?
Hey, don’t know if you’ll ever see this considering it’s been 8 years but it was a System Sensor 2400. I didn’t know back then so I guess I didn’t respond. 
Are you selling any?
I am not. The only device close to it that I own is an 895B-201, and I only have one so I’ll be keeping that.