The alarm ring for 5 seconds at a sound volume of 80~90 db when time reaches zero, Easy to hear in another room. This timer is designed to be small and light. Powered by winding up, no battery is required, Solve the inconvenience of frequent battery change. Completely mechanical - ! So you can carry it anywhere in your home without worrying about it losing power Turn the timer clockwise until it reaches "55" to prepare it.Then turn counterclockwise to the desired time to the timer. When the timer ends, it make a loud ring. This 60-minute timer is suitable for any place, simple solid color design makes it inconspicuous in any environment; great time management tool for school, homework, office, meeting room, etc.; specially designed for children, Design for parents, teachers, , office workers and students