Kidde Battery-Operated Combination Smoke & Carbon Monoxide Detector Batteries Included Experience the next level of fire safety with the Kidde Battery-Operated Combination Smoke & Carbon Monoxide Detector Batteries Included model 30CUDR a 5-inch combination smoke & carbon monoxide detector that uses photoelectric sensor technology to detect visible fire particles associated with smoldering fires and electrochemical sensors to detect poisonous carbon monoxide gas. New 9th Edition sensor technology reduces false alarms often caused by cooking or shower steam while internal components of the smoke alarm self-test to ensure that it s always operating as expected. (Self-testing is not a substitute for a manual push test of the alarm. Perform a button test once per week to verify proper alarm operation.) The Kidde Combination Smoke & Carbon Monoxide Detectors 5-inch design provides smoke detection for all living spaces such as your basement living room bedroom kitchen den bathroom or crawlspace. When s