Turn the timer clockwise until it reaches "55" to prepare it.Then turn counterclockwise to the time to the timer. When the timer ends, it will make a loud ring.The alarm will ring for 5 seconds at a sound volume of 80~90 db when time reaches zero, Easy to hear in another room.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 powerThis timer is designed to be small and light.This 60- 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 studentsColour:black+whiteMaterial:ABSSize: 6 x 6 x 3.5cm Package Contents:2 x timerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.