BRAND NEW / NEVER USED First Alert Battery Powered Z-Wave Smoke Detector & Carbon Monoxide Alarm, Works with Ring Alarm Base Station, 2nd Generation Z-Wave Combo - 2nd Generation Battery Powered / includes 2 AA batteries. Dimensions 2"D x 5"W x 5"H Item Weight 0.68 Pounds This device is certified to work with Ring; Receive real-time notifications in the Ring App when smoke or carbon monoxide is detected. Certified to work with smart home systems such as Ring Alarm Base Station, Samsung SmartThings, and Nexia Home Intelligence. Help keep your family safe with this battery-powered smoke detector and carbon monoxide alarm; The Z-Wave Plus with Smart Start feature allows a faster and more intuitive connection of device to hub and on-boarding via QR code scan located on device Photoelectric smoke sensor helps reduce false alarms caused by cooking or shower steam Includes an 85-decibel horn, single test/silence button, side access to a tamper-resistant battery door, and pins that lock the alarm to the mounting bracket