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Power supply: DC 12V or DC24V(Optional). Operation current: 500mA@12V or 250mA@24V Holding Force : 1200LBS. Fail-safe type (Power to lock). SL-220 Built-in lock status LEDs indication. / SL-220S No lock status LEDs indication.SL-220T Buid SL-220 Electric door lock SL 220 Electric door lock