It makes a loud beep beep when you close the locking mechanism to let you know the alarm is active. It's cool because anyone around you can hear that you have an alarm on your motorcycle! This thing is solid as a rock and the handlebar cable to remind you that its on. It has a warning triple beep to let potential theives know its armed when someone touches it. Then if its tampered again the alarm goes of. And it is gut wrenching, ear bleeding, soul scratching loud!! It's really unique unlike those cheap diary keys or vending machine keys. Its impossible to pick this lock or even attempt to without setting the alarm off! Dont hesitate on buying this with how much people are stealing bikes these days!