Continue shopping “FIRST ALERT(R) – First Alert 1039879 Smoke (SA303) & Carbon Monoxide (CO400) Detector Combo Pack” has been added to your cart. Remove item Thumbnail image Product Price Quantity Subtotal × FIRST ALERT(R) - First Alert 1039879 Smoke (SA303) & Carbon Monoxide (CO400) Detector Combo Pack $38.11 FIRST ALERT(R) - First Alert 1039879 Smoke (SA303) & Carbon Monoxide (CO400) Detector Combo Pack quantity $38.11 Coupon: Apply coupon Update cart Cart totals Subtotal $38.11 Shipping Flat rate: $5.50 Shipping to MA. Change address Country / region: Select a country / region… United States (US) State / County: Select an option… AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict Of ColumbiaFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyomingArmed Forces (AA)Armed Forces (AE)Armed Forces (AP) City: Postcode / ZIP: Update Tax $0.00 Total $43.61 Proceed to checkout