The Kidde Hardwired Smoke & Carbon Monoxide Detector and Kidde Hardwired Smoke Detector Bundle offers comprehensive fire and carbon monoxide detection for your home. The smoke and CO detector provides 2-in-1 protection, alerting you to smoke and carbon monoxide. Its enhanced sensing technology reduces false alarms from cooking while still quickly alerting you if hazards are detected. Similarly, the smoke detector uses enhanced sensing to avoid false alarms while still detecting fires early. Both detectors offer 10-year battery backup so you'll never need to replace batteries. They connect wirelessly to create an interconnected system that ensures every detector sounds an alarm if one detects an emergency. The smoke & CO detector provides voice alerts to specify if smoke or CO is detected. Both models have been comprehensively tested to meet the latest UL safety standards. With modern 5-inch designs and features like self-testing components and LED status lights, these hardwired detectors take residential safety to the next level. Having both smoke and multi-purpose CO/smoke detection gives you complete fire safety so you can rest easy knowing your home and family are protected.