3PK Wireless Interconnected Smoke Detector and 1PK Wireless Interlinked CO Detector, X-Sense SD19-W Smoke Alarm + XC01-WR CO Alarm

SD19-W wireless interconnected smoke alarm is built with a 10-year sealed lithium battery and connects to other X-Sense Link+ alarms for full-home coverage. The XC01-WR Wireless Carbon Monoxide Alarm with 10-Year Sensor Life, Portable design without installation, Replaceable Battery-Powered CO Alarm with Real-time Digital Display and Peak Value Memory.