Make offer or Buy Now before it sell Out - We list on all Selling platforms to sell Fast Condition - 100% New in Box OPEN This Kidde Detect Smoke and Carbon Monoxide Alarm 4-Pack offers advanced safety for your home with a modern 5-inch design suitable for all living spaces. Each alarm features dual detection technology to alert you to both smoke and carbon monoxide using a single, cost-effective device.The alarms include self-testing functionality to ensure they are always operating as expected, providing added peace of mind. Installation is simple and convenient with the included twist-and-click mounting bracket. End-of-life notifications alert you when it's time to replace the unit after 10 years. Reliable, easy to use, and designed for long-lasting protection.