ONELINK products from First Alert allow owners to control and monitor their homes from virtually anywhere. The Onelink Hardwired Smoke and Carbon Monoxide Alarm utilizes 10 year battery technology, Apple HomeKit compatibility, bluetooth and Wifi technologies to achieve peace of mind. Providing two in one protection, the Onelink Smoke and Carbon Monoxide Alarm with 10-Year Sealed Battery also implements both photoelectric and electrochemical sensors that allow for ten years of continuous protection against the many threats posed by smoke and carbon monoxide. The Onelink Wi-Fi Thermostat enables you to control the temperature of your home and program a schedule using the free Onelink app and your iPhone or iPad. The free app even displays the current outdoor temperature reading and a three-day weather forecast to help you set heating and cooling schedules in advance.