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NJ-320A-S is heavy-duty-type ANSI standard fail safe electric strike lock with feedback signal output.It works with magnetic force generated by electromagnetic field for locking/unlocking,particularly with short circuit protection.This model has 2 working modes:Power-to-open & Power-to-lock.It is made of high-quality stainless steel for high hardness, corrosion resistance & anti-deformation.It is suitable for all types of wooden door, metal door, PVC door etc.