Surge Protective Extra Heavy-Duty Duplex Receptacle offers increased transient protection, reliability and protection notification (Audible Alarm with LED Indicator). Back & Side Wire, 20amp 125volt, Brown.PRODUCT FEATURES:- RoHS Compliant - Solid-state LED monitor has 25-year minimum life expectancy. A high visibility, wide-angle lens indicates protection is in place. - LED Indication: Steady green = protected, Flashing re = not protected, OFF = no power to unit - Audible alarm alert of MOV damage. Alarm able to be turned On/Off. - Wrap-around steel strap for structural integrity. Auto-ground is standard, for easier installation. - Impact-resistant thermoplastic exterior resists impacts and scrapes. - Triple-wipe, copper-alloy contacts for superior, more dependable connection. - External screw-pressure-plate back and side wire terminals including ground with external back wire clamps (exclusive) accept #14 - #10 AWG copper or copper-clad, solid or stranded conductors. External pressure plate feature allows two conductors to be terminated by a single screw. - Thermal protection in 3 modes. 3 17mm dual pack MOVs absorb up to 340 Joules of excess energy in each leg (L-N, L-G, N-G) with 24,000 amp current handling capability for full, equal and symmetrical protection. Protection response time in less than one nanosecond.