1. Watch strap and case material: stainless steel 2. Watch mirror: synthetic sapphire mirror 3. Movement: original mechanical movement 4. Waterproof: 30 meters life waterproof 5. Diameter: 40mm, thickness: 12mm, inner circumference: 20cm, width: 20mm 6. Display the sun pattern during the day, the moon pattern at night, and move with the day and night. 7. Luminous display, easy to check time at night 8. Butterfly double snap, sturdy and durable, easy to operate 9. Fashion design, comfortable to wear
