Features: Electronic classroom countdowns visual timers, up to 60 minutes for time limit, dials decreases as for time progresses Quiet Counting, for classroom teaching for time counting record,Student reading,homework kitchen cooking and office meeting. Double colour dials panel, look at the timers just a glance. Double magnets becside easy to stick on blackboards,refrigerator and more metal front firmly. How should you operate the timers:1. Turn clockwise to "55" (towards "5")2. Turn counterclockwise to the desired time3. The timers will ringing, and the ringing time is about 3-4 second. Specifications: Materials: Plastic ABS Type: Timers Color: as the picture shows Size:16x3.50cm/6.3x1.38inch Quantity: 1Pc Package Includes: 1Piece Kitchen timers note: 1.Please allow 1-3cm error due to manual measurement. Please make sure you do not mind. 2.Due to the differences between different monitors, the picture may not reflect the actual color.