A toroid core saves energy and is 10% more efficient then an El-type core, and runs cooler and quieter (no hum), and runs smoother (no vibration) * Contractor relay featured which reduces amp draw through the timer, photocell, and receptacle- extending the life of these components * Fully enclosed housing measures 21-Inch high, 6.75-Inch wide and 6-Inch deep; mounting brackets welded and riveted for extra strength * Tilted terminal board and large size lugs inside the taps hold up to eight 10-gauge wires or up to ten 12-gauge wires per tap and one photocell outlet * 3-foot 12-3 SJTW cord allows a safe distance to lessen shock hazards; submersible rating to comply with submersible standards when fixture is in water