There were reports from domestic and foreign users that the emergency siren app was somewhat effective in preventing crime. As a developer, I am proud of the emergency siren as it is performing the proper function in line with the purpose of development. ^^ Be sure to install the emergency siren on your loved ones and children's smartphones. ■ Siren A siren sounds with an emergency siren signal. Try using it in case of emergency. You can adjust the siren sound volume. Not only that, you can als