Product description: 1. Material: 304 stainless steel, PP plastic 2. Weight: 150g3. Size: 10x10x10cm4. Features: Mechanical inner core rotation Features: 1. Mechanical inner core, no battery needed, reducing gear rotation failure rate2. Manual winding, battery-free, no power consumption, durable and more accurate, environmentally friendly and money-saving3. How to use: Before use, set the scale to zero, turn clockwise to 55 scales, and counterclockwise to 15 scales (cut the object directly from 0 and rotate counterclockwise, forcibly rotating counterclockwise will damage the timer) 4. Every time you use it, you must turn 55 scales clockwise, not more than 0 scales, there will be a 3-5 second ring to remind you to put on the spring 5. 60 decibels comfortable ring, 5 seconds to remind you not low and not ear-piercing6. A magnet is embedded at the bottom, which can be easily attached to the metal surface, saving desktop space7. Red visible film, clear and clear scale lines 8. 304 stainless steel shell, durable and not afraid of bumps