BabyBell is equipped with speech recognition AI. It analyzes the sound acquired from the microphone in real time and judges whether it is an infant cry. When BabyBell judges to be crying, it notifies the user by screen display and vibration of the smartphone. It works even if the application is not displayed on the screen. Even if you are doing other work such as web browsing or e-mails, BabyBell will notify you as soon as it detects the baby's crying voice. * In order to prevent unintentional continuous use, if BabyBell have not detected crying for 30 minutes, a confirmation message will be notified. * In noisy surroundings, it may be impossible to perfectly detect the baby's crying voice. This application was developed for mothers and fathers with hearing disabilities and their children. I hope this application will be useful.