Tamper-Resistant Extra Heavy-Duty Surge ProtectiveDuplexReceptacle offers increased transient protection, reliability and protection notification (Audible Alarm with LED Indicator). Back & Side Wire, 15amp 125volt, Blue.FEATURES;- Dual mechanical shutter system to help prevent insertion of foreign objects.- Auto-ground clip assures positive ground.- Easily accessed break-off line-contact connecting tab for fast and easy split-circuit wiring.- Backed-out tri-drive brass terminal screws for faster installation.- Internal screw-pressure-plate back and side wire capability.- Two back wire holes for additional wiring flexibility.- Corrosion-resistant plated steel strap is locked in to face and back body to resist pulling away from the face/body assembly.- .032 inch thick brass triple-wipe power contacts.- Two drive screws anchor steel strap to back body and face where abrupt removal torque is greatest.