Keychain Siren

Loud Sound Alert Device for SOS, self-defense, emergency when women, school kids, girls or night runners use to deter potential crime or draw attention nearby for urgent help in an emergency. It emits a very high-pitched, 130db loud sound which might sound very piercing or uncomfortable if you are extremely sensitive to this type of sound. But please be aware that this harsh sound is indeed very effective at achieving the purpose of deterring potential crime.