900-CUAR DW Smoke/CO With AA BBU 2-In-1 Detection - Smoke Detector-Carbon Monoxide Detector Combo Alerts You to Both Smoke And Carbon Monoxide In A Single Alarm. Whole-home Alarm Activation - Expand detection via hardwired connections to other select Kidde alarms so when one alarm sounds, they all do. 120V AC hardwired with AA backup batteries - provides reliable detection, even during power outages Photoelectric smoke sensor detects visible fire particles associate with slow, smoldering fires sooner than an ionization sensor Electrochemical sensor detects carbon monoxide & remains stable during humidity changes & unstable temperatures One-Touch button activates the Hush feature to temporarily silence nuisance alarms, tests the detector's electronics & verifies proper operation, & silences low battery chirp for up to 24 hours, maximum of 7 days End of life chirp alerts user to replace the smoke detector-carbon monoxide detector combo after 10 years of operation. An 85-decibel alarm will sound when the smoke and CO alarm senses a smoke or carbon monoxide hazard LED warning indicators alert you to various status.

• 2-In-1 Detection - Smoke Detector-Carbon Monoxide Detector Combo Alerts You To Both Smoke And Carbon Monoxide In A Single Alarm
• Self-Testing - Smoke and carbon monoxide detector uses internal, self-testing components that are always checking to ensure the device is operating as expected (not a substitute for weekly manual testing)
• Whole-home Alarm Activation - Expand detection via hardwired connections to other select Kidde alarms so when one alarm sounds, they all do**
• Easy install mounting bracket (included) for quick installation in 4 orientations

Smoke Detector. Smart Hush control. Flashing LED status ring allows easy identification of current state of alarm. 120 VAC (60 Hz, 53 mA max) hardwire. 120 VAC (60 Hz, 53 mA Max). Mfg #P4010ACS

• Photoelectric Sensing Technology
• 10 year sealed lithium battery backup
• Voice messaging system
• Ambient light sensor

Hardwired Smoke/CO Combo Alarm w/ 10 Year Battery Backup, Package Of 4. Flashing LED status ring allows easy identification of current state of alarm. AC hardwired combination. Package Of 4. Mfg #P4010ACSCO

• Photoelectric Sensing Technology
• Voice messaging system
• Ambient light sensor
• Smart Hush control