3PK Wireless Interconnected Smoke Detector and 1PK Wireless Interlinked CO Detector, X-Sense XS01-WR Smoke Alarm + XC01-WR CO Alarm

XS01-WR is a wireless interconnected smoke alarm with a 5-year replaceable battery. The XC01-WR Wireless Carbon Monoxide Alarm with 10-Year Sensor Life, Portable design without installation, Replaceable Battery-Powered CO Alarm with Digital Display and Peak Value Memory.