Check the listing for details. BRK Hard-Wired Ionization Smoke and Carbon Monoxide Detector. Condition: New. Listed at 64.95 USD. BRK Hard-Wired Ionization Smoke and Carbon Monoxide Detector Offers combination smoke and carbon monoxide detectors with features like battery backup, voice location and wireless interconnect to protect.BRK's Precision Detection advanced sensing technology reduces cooking nuisance alarms and delivers early warningInterconnects with most First Alert and BRK alarms so when one sounds, all compatible alarms sound to provide an early warningBattery backup provides continuous protection during power outagesPerfect mount bracket keeps the alarm secure over a wide rotation range for ideal alignment and easy installationLatching Alarm Indicator visually identifies the unit that initiated the alarm or low battery warning Specifications:Brand Name: BRKPower Type: Hard-WiredSensor Type: IonizationProduct Type: Smoke and Carbon Monoxide DetectorNumber in Package: 1 eachBattery Size: 9-voltBatteries Included: YesLow Battery Indicator: YesPackaging Type: Boxed