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It installs between the RJ31X Phone Jack and the Security Control. The ELK-952 features multi-stage protection and is 5 times faster than MOVs. • 5 Stage Surge Protection • Very Economical • Easy to Install • Works with Any Security Control INSTALLATION INSTRUCTIONS This device installs in-line between the RJ31X Phone Jack and the Security Control. It features multi-stage protection: (Tip-Ring, Tip-Ground, Ring-Ground) utilizing Gas Discharge Tube, Spark Gaps, Clamping Diodes, and series i