Smoke & Carbon Monoxide Detector, Hardwired, Interconnect Combination Smoke & CO Alarm with Battery Backup, Voice Alert, Pack of 2

Combined fire and carbon monoxide detector featuring alert modes, LED indicators, and voice alarm. It announces 'Fire! Fire!', 'Warning! Carbon Monoxide!', or 'Low Battery!'. Ionization sensing technology: the hardwired smoke alarm identifies invisible fire particles, and the 85-decibel alarm signals a fire. Operation during power loss: the combination smoke and CO alarm functions on a 120VAC power supply with 2-AA battery backup. Test-Hush Feature: quiets the device for about 9 minutes. Tamper-resistant design helps prevent removal from the wall or ceiling