Small Circular Mechanical Chain Timer Rotating Timer For Students To Learn Problem-solving Timer Features: Mechanical winding, classic designs: using mechanical winding, no battery required, retro classic, easy to operate, suitable for students and office workers. Rotating timing, timing: Set the time by rotating the dial, support countdown function, accurately control learning, problem-solving or work time, and improve efficiency. Compact and portable, available everywhere: With its small size and lightweight, it can easily into a backpack or pencil case, making it convenient and practical to use anytime, anywhere. Multi functional and flexible: not suitable for learning timing, but also for various scenarios such as cooking, sports, meetings, etc., meeting needs. Product Description: Name: Timer Material: Plastic Weight: 82g Size：7*4.5cm Packing list: 1x timer Mechanical Wind-Up Timer - Retro Classic Plastic Timer with Rotating Dial for Countdown, Compact 7x4.5cm Portable Kitchen/Study/Office Timer (82g) - No Battery Needed Temperature Controller Birthday Gifts Christmas Gifts