Was grooming a dog and noticed it flash green when I was taking it off, thought it was a camera at first but when I finished and was putting it back on I had a closer look and I've never seen anything like this and I've seen A LOT of dog collar things. I tried Google lens but got nothing back even with basic keywords it said it couldn't be processed due to content guidelines :S is it a barking deterrent maybe? I haven't seen one like this, maybe it makes a sound if it hears a bark? It didn't go off at any point or my own dog would have had an anxiety attack, and there was a lot of barking going on, albeit not from the dog wearing it. There's no sensors on the back just rubbery straps to hold it on the collar.