Went out to Stockton to see this STL-10A located in a fenced area at the school track field, sirens in Stockton sounded a minute early for a 3-min alert cycle. Unbeknowngst to me, that this would fire up again for an additional 3-min alert cycle afterward the first activation. Sirens in Stockton are tested on the Second Wednesday at 10 AM (weather permitting). Enjoy!
Oh this is so cool! I was in Stockton recently checking out their system as well, I took some glamour shots of this STL-10. It's so awesome to get to see it in action, thanks for the video!