Onelink Wi-Fi Smoke + Carbon Monoxide Alarm, Battery, Apple HomeKit-enabled Wi-Fi Smoke and Carbon Monoxide Alarm is HomeKit-enabled to send notifications to your Apple device (requires iOS 9.0 or later) Combination smoke detector/carbon monoxide alarm detects 2 threats 10-year sealed battery ensures consistent protection for the lifetime of the alarm Can connect with compatible alarms via Bluetooth (additional alarms sold separately) Voice alarm can be programmed to announce where and what the threat is