Kidde 10-Year Sealed Lithium Battery-Operated Combination Smoke & Carbon Monoxide Detector Experience the next level of fire safety from Kidde with the Kidde 10-Year Sealed Lithium Battery-Operated Combination Smoke & Carbon Monoxide Detector model 30CUD10 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