The Onelink by First Alert Smoke and Carbon Monoxide Alarm (AC Power with 10-Year Battery Backup) makes your home a safer place by keeping you connected via an app on your iPhone, iPad or iPod touch. Easy to set up and install, this alarm will alert you with notifications in the event of a smoke or carbon monoxide emergency. Apple HomeKit-enabled, the sealed battery back-up gives you 10 years of protection with no battery replacements. Easily replace existing alarms or install new hardwired alarms into your home's electrical system. This smart alarm can replace most 120-volt AC hardwired alarms without having to rewire. Simply use the included adapter plugs. The alarm notifies you instantly when something is not right. When one Wi-Fi Smoke and Carbon Monoxide alarm goes off, all compatible hardwired, interconnected alarms will sound as one. It will also talk to you, letting you know what the danger is and where it is located. Plus, this alarm is HomeKit enabled so it can work with other accessories on the same platform. Apple HomeKit makes it easy to discover, group and control HomeKit-enabled accessories in your home. Test and silence your Wi-Fi Smoke and Carbon Monoxide alarm by using your iPhone, iPad, or iPod touch with iOS 9 or later. This product is intended for nonprofessional, do-it-yourself installation.