First Alert 10 Year Battery Hardwired Combination Smoke and Carbon Monoxide Detector Item #749769 Model #WS84503 seal replacement) or expansion device seal replacement) or expansion device adjustments may be required in some applications This 20 volt MAX cordless 3 speed brushless Oscillating multi tool includes a universal accessory adapter and wood cutting blades to help get your project started all compatible* alarms will sound Install convenient 2 in 1 protection against both smoke and carbon monoxide with the First Alert SMICO105 AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10 Year Battery Backup