Product Description Product Features: 1. High-definition mirror surface reflects light and shadow, paired with a silver rotating casing, creating a stylish and smooth visual effect. The design is simple, lightweight, and agile. 2. Precise electronic timer; no need to repeatedly press the mechanical button every 5 seconds for quick and easy time adjustment. 3. Large mirror surface paired with a high-definition digital display; numbers are clearly visible whether standing or sitting. 4. Silent digital display timing design ensures quiet operation, ideal for quiet study and focused work. 5. Three-level timing reminder to adapt to different environments and volume requirements. 6. Timing range from 00:00 to 99:55, supports forward and reverse timing for convenient and quick time measurement. 7. Easily adheres to blackboards, refrigerators, and other metal surfaces, firmly and not easily detached. Note: - Due to differences in monitors and lighting, the actual color may vary slightly. - Please allow 1-3 cm error due to manual measurement. Product Information: 1. Name: Rotary Countdown Timer 2. Material: ABS 3. Color: Black 4. Operating Voltage: 4.5V (Requires 3 AAA batteries, not included) 5. Operating Temperature: 0°C to 50°C 6. Timing Range: 99 minutes 55 seconds 7. Volume Settings: Mute (0dB), Low (60-70dB), High (80-90dB) 8. Product Dimensions: 78 x 78 x 27.5 mm 9. Countdown Settings: - Rotate the knob to set the desired countdown time; press the mirror to start the countdown. - Rotate clockwise to increase the time, rotate counterclockwise to decrease the time. - Rotation angles greater than 60 degrees allow for rapid adjustment of minutes; rotation angles less than 60 degrees adjust seconds at a normal speed. - Forward timing: Set to 00:00, press the mirror to start the timer. Press and hold for 1 second to pause the timer. Package contents: 1 x Timer