2 PCS HR1688 Quartz Clock Movement, Spec: 17mm x 9.7mm 1. The movement gear is made of high-quality nylon material, offering flexibility, low noise, and long service life. 2. The HR1688 movement features an electronic coil wound with high-quality enameled copper wire. The stator is made of nickel-iron material for high magnetic permeability and low resistivity, contributing to energy efficiency. 3. Crystal frequency: 32.768 kHz 4. Time accuracy: ±30 seconds per month (at 1.5V DC, 25°C) 5. Current consumption: Less than 130 µA (at 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 (batteries not included) 9. Weight: Approx. 25 g per piece 10. Second hand output torque: ≤ 0.6 gf·cm (at 1.5V) 11. Minute hand output torque: ≤ 30 gf·cm (at 1.5V) 12. Pointer specification requirements: - Second hand: max. length 130 mm, max. weight 2 g, max. unbalance torque 0.15 gf·cm - Minute hand: max. length 200 mm, max. weight 6 g, max. unbalance torque 6 gf·cm Note: The movement battery compartment does not include a battery cover. Includes gold hexagonal nut, gold washer, and black rubber pad.