Electrically locking and unlocking both levers (inside and outside cylinders) - Both levers continuously locked (EL) or unlocked (EU) by 12 or 24V DC. EL is fail safe (power failure allows outside knob/lever to retract latchbolt). EU is fail secure (power failure locks outside knob/lever). Latchbolt retracted by key on either side unless electrically locked, or knob/lever on either side when electrically unlocked. Note that locking both levers will prevent normal egress from the inside. Auxiliary latch deadlocks latchbolt when door is closed. - Caution: Double cylinder locks on residences–or on any door in any structure which are used for egress–are a life safety hazard in times of emergency, and their use is not recommended.
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