BRK BRANDS SC9120B - AC/DC COMBO SMOKE/CO ALARM - SMOKE/CARBON MONOXIDE ALARMS HARDWIRED - IONIZATION BATTERY BACKUP COLOR=WHITE - COMBINATION 120 VOLT AC SMOKE AND CARBON MONOXIDE ALARM WITH 9-VOLT BATTERY BACKUP, INTERCONNECTABLE WITH ALL BRK SMOKE AND CO ALARMS. IT ELIMINATES THE NEED FOR TWO SEPARATE ELECTRICAL BOXES, SAVING INSTALLATION TIME AND MATERIALS. SEPARATE VISUAL AND AUDIBLE SMOKE AND CO INDICATORS ELIMINATE CONFUSION. CONTROLS CAN SILENCE THE LOW-BATTERY CHIRP FOR UP TO EIGHT HOURS OR TEMPORARILY SILENCE AN UNWANTED NUISANCE ALARM. LATCHING ALARM INDICATOR, MOUNTING BRACKET AND BATTERY DRAWER LOCKS. THE ALARM MEETS BUILDING COD - EQUAL TO 6456818