2 PCS HR1688 Quartz Clock Mechanism Movement,Spec: 28mm 20.5mm 1. The movement gear is made of high quality nylon material, which is flexible, low noise and long service life. 2. HR1688 movement of the electronic coil not only with sufficient material coil and the use of high-quality bright copper lacquer wire winding, in addition to the stator piece is also the choice of nickel-iron materials, its high magnetic permeability, low resistivity has a power-saving effect. 3. Crystal frequency: 32.768KHz 4. Time accuracy: +-30SecMonth(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: -10-50 degrees Celsius 8. Power supply: 1.5v AA batteries (batteries are not included) 9. Weight: approximate 25gPC 10. Second hand output torque: less than or equal to 0.6gf-cm (1.5V) 11. Minute hand output torque: less than or equal to 30gf-cm (1.5V) 12. Pointer specification requirements: -Second hand lengthweight: less than or equal to 130mm, less than or equal to 2g -Minute hand lengthweight: less than or equal to 200mm, less than or equal to 6g -Second hand unbalance torque: less than or equal to 0.15gf-cm -Minute hand unbalance torque: less than or equal to 6gf-cm Note: The movement battery slot is generally not equipped with a battery cover, with gold hexagonal plane nut, gold washer, black rubber pad