Caution: You do have to turn the dial the way clockwise and then back counter clockwise to the time that you want in order for the alarm to go off. Mechanical Visual Timers:This magnetic timer for kids and adlut suitable for a variety of scenarios.Improve time management, perform tasks effectively. No Battery Required:This visual timer has superior quality and could work longer with precision mechanical design.Mechanical clockwork design makes it without battery,You can easily twist to make it work , can be placed on any metal surface such as Fridge, Refrigerator and microwave etc.Best for moms, children, parents, teachers, office staff, professionals, and students. A good gift for anyone who's needs to see exactly how much time they have left to do a chore, read, watch tv, etc.