This app is for the elderly 65 years of age or older with mobility difficulties, the disabled, dementia patients, severely ill, single households, kindergarteners, elementary, middle and high school students, etc. It is a safety service app developed to prevent damage by sending text messages or warnings (sound, vibration, etc.) toIt is operated by mobile phone without a separate server and does not contain personal information, so anyone can use it without risk of leakage of personal information.The app will not work if the phone is turned off. Always check and charge your phones battery.