A 2-in-1 wireless combination smoke & carbon monoxide alarm, equipped with a 10 year battery that lasts the life of the alarm. No annoying low battery chirps in the middle of the night. No wobbling on a ladder to replace batteries. Premium protection that just works.Remote access to your alarm means you will be notified in the event of a smoke or carbon monoxide emergency in your home from anywhere. From the palm of your hand, you will be alerted to the type and location of danger and can call 911 directly from the app.