1. Material: ABS 2. Mechanical movement, ring the bell to remind, without battery drive 3. Foot pad EVA material, anti-skid and wear-resistant, do not hurt the table top 4. Cultivate the concept of time, plan the time reasonably, and improve the learning efficiency 5. When first in use, it must be twisted to 55 minutes, this step is timing on the chain 6. Size: 6.8x6.5 cm 7. Weight: about 75 grams
