2 PCS HR1688 Quartz Clock Mechanism Movement, Spec: 22.5mm 14.5mm 1. The movement gear is made of high-quality nylon material, which is flexible, low noise, and offers a long service life. 2. The HR1688 movement electronic coil is wound with high-quality bright copper lacquer wire and sufficient material. The stator uses nickel-iron material, which has high magnetic permeability and low resistivity, contributing to power efficiency. 3. Crystal frequency: 32.768KHz 4. Time accuracy: ±30 seconds per month (1.5V DC, 25 degrees Celsius) 5. Current consumption: Less than 130μA (1.5V DC) 6. Operating voltage: 1.3V to 1.7V 7. Operating temperature: -10°C to 50°C 8. Power supply: 1.5V AA battery (battery not included) 9. Weight: approximately 25g per piece 10. Second hand output torque: ≤ 0.6gf-cm (1.5V) 11. Minute hand output torque: ≤ 30gf-cm (1.5V) 12. Pointer specification requirements: - Second hand length/weight: ≤ 130mm, ≤ 2g - Minute hand length/weight: ≤ 200mm, ≤ 6g - Second hand unbalance torque: ≤ 0.15gf-cm - Minute hand unbalance torque: ≤ 6gf-cm Note: The movement battery compartment is generally not equipped with a battery cover and includes a gold hexagonal flat nut, gold washer, and black rubber pad.