Time Signal is a free Android app designed by Moyou under the lifestyle category. The app is equipped with a text-to-speech (TTS) engine that can read the time and any input text by voice, aside from the pre-installed time signal sound. It also supports public holidays of multiple countries and regions through the use of the "Google Calendar API," which allows users to register personal holidays. The app can disable or enable repeat time signals on public or private holidays.

The app features an alarm clock function managed by the calendar, which can be used in cooperation with the "Alarm Calendar" app. Users can choose from various sounds such as time signal sound, beep sound, cuckoo clock, wall clock, and more. The app allows users to specify the time signal at any time other than the hour, repeat it on specific days of the week, and adjust the volume and number of beeps. It also has a vibration function.