First Alert SCO501CN-3ST Wireless Interconnected Combo Smoke & CO Alarm w/ Voice Alerts Conduit & Fittings The Lock-In System lets you

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First Alert SCO501CN-3ST Wireless Interconnected Combo Smoke & CO Alarm w/ Voice Alerts Conduit & Fittings The Lock-In System lets youThe First Alert Combination Smoke and Carbon Monoxide Alarm with Voice Location detects both smoke and carbon monoxide. It is a wireless enabled battery operated interconnected detector that features an 85 decibel alarm plus a voice alarm to let you know where the danger is. This technology allows other compatible First Alert wireless enabled alarms located in several areas of your home to communicate with each other, alerting you to a problem early