The timer has a 70dB alarm and a 3-second sound when the time is up. The timer has a round dial with a magnetic design on the bottom. Can be attached to metal surfaces such as refrigerators, microwave ovens, ovens, and blackboards Setting the timer takes just two steps: first turn clockwise to 55 minutes, then turn counterclockwise to the desired time. This mechanical timer is completely battery-free, making it Perfect for classrooms, offices, kitchens, gyms and more. This is a great time management tool for school, homework, offices, conference rooms, and more. Designed for children, parents, teachers, , office workers and students. Colour:black Material:ABS+metal Size:8.5cm Package Contents: 1 x timer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.