This siren comes with a good sized clip for easy on and off key fob. You can remove the pin or press the big SOS button to trigger an alarm. It wasn't intuitive for me to figure out how to turn it off, which would be nice if there was a villain. I had to read the instructions and to turn off the alarm you have to press and hold the big button for 3 seconds. The alarm siren is so loud. There's also a flashlight, where you press the button once to keep it on, again to flash the light, and again to turn it off. It's easy too.
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