The products are applicable for Watt-hour meters or energy meters. Specifications: 1. Work voltage: 2.5V - 5.5V 2. DC impedance: 450Ω ± 50Ω/23°C 3. Applicable pulse width: ≥50ms 4. Applicable frequency: ≤10Hz 5. Output torque: ≥60μNm/5v 6. Work temperature: -40°C～70°C 7. Use life：Billion times（15 years） 8. Antimagnetic capability: according to IEC61036 standard . 9. Other technical conditions: according to JB5459-91 standard. 10. Applicable meter constant: 800/1,600/3,200/6,400imps/kW?h. 11. Speed ratio: 100:1, 200:1, 400:1, 800:1 12. Figure display：5+1, i.e. 00000.0--99999.9 or 6+1, i.e. 000000.0--999999.9 13. Lamination of Motor: Ferrous Alloy with 50% Nickel. 14.Antimagnetic Shielding:The stepper motor box should be shielded using (Optional)MS to prevent tempering with influence of external AC/DC magnetic Fields of 2.5 Tesla. 15. We can manufacture according to clients specifications.