Product features: no battery required, accurate timing, visible dial, extra-large bell, one-twist and goApplicable scenarios: reading, homework timing, sports and fitness, kitchen cooking, etc.Style: Astronaut styleSpecifications: Magnetic styleWeight: 125gCorrect use method:1. Reset to the original state2. Turn clockwise to 55 scale (turn to 0 for 1 hour)3. Turn counterclockwise to the required scaleNote: Do not rotate directly counterclockwise in the original state, as this will damage the device!Knowledge tips:1. Each time you use it, you must turn it to 55 scale (do not exceed the "0" scale)2. This timer is mechanical, and turning it to 55 scale is for winding3. Wind up the spring, and there will be a 3-5 second bell reminder after the time is up.Packing list: 1*Astronaut style