A self-defense alarm can be attached to a purse, backpack, keys, belt loops, and suitcases. It can also be brought onboard a plane, which is really convenient and fits for students, joggers, elders, kids, women, and night workers. With ear-piercing sound to draw others’ attentions even 300 yards away when you're in danger. Up to 50 minutes of continuous sound to ensure emergency use. It will replace self-defense weapons to protect your safety, such as pepper spray.