No Batteries Needed: This mechanical timer is completely battery-free, making it a great choice for classrooms, offices, kitchens, gyms, and more. Sound Alarm and Time: The timer has a 70dB alarm and a 3-second sound when the time is up. Starry Sky Design: The timer features a round dial with a magnetic design on the bottom. It can be attached to metal surfaces such as refrigerators, microwave ovens, ovens, and blackboards. It's also great for leaving tips and is a hit with kids and parentsalike. EASY TO USE: Setting the timer is as simple as two steps: first, turn clockwise to the 55 minute mark, then turn counterclockwise to the desired time. Versatile: This 60 minute timer is perfect for any occasion. It's an excellent time management tool for school, homework, office, conference room and other events. It is specially designed for children, parents, teachers, cooks, office workers and students. Size: 8.5*8.5cm