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:blackandwhiteMaterial: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.