2 PCS HR1688 Quartz Clock Mechanism Movement, Spec: 22.5mm x 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 uses sufficient material and high-quality bright copper lacquer wire winding. The stator is made of nickel-iron material, offering high magnetic permeability and low resistivity for power-saving performance. 3. Crystal frequency: 32.768 kHz 4. Time accuracy: 30 seconds per month (1.5V DC, 25 degrees Celsius) 5. Current consumption: Less than 130A (1.5V DC) 6. Operating voltage: 1.3V to 1.7V 7. Operating temperature: -10C to 50C 8. Power supply: 1.5V AA battery (battery not included) 9. Weight: Approximately 25g per piece 10. Second hand output torque: 0.6 gf-cm (1.5V) 11. Minute hand output torque: 30 gf-cm (1.5V) 12. Pointer specification requirements: - Second hand length/weight: 130mm, 2g - Minute hand length/weight: 200mm, 6g - Second hand unbalance torque: 0.15 gf-cm - Minute hand unbalance torque: 6 gf-cm Note: The movement battery compartment is generally not equipped with a battery cover; includes gold hexagonal flat nut, gold washer, and black rubber pad