STI-1200A-HTR SKU STI-1200A-HTR-2658 Stopper II Heated w/4'' Deep Bkbx - 110 VAC Please log in to see price or purchase this item Request an account Line Comment Special Price Features:Protective polycarbonate cover with heaterHelps stop false alarms4 deep enclosed back box110 VAC heaterUL/cUL Listed, ADA Compliant3 yr guarantee, 1 yr on electronics