This 2 pack features a First Alert PR710 10 year battery photoelectric smoke alarm with slim design and a First Alert CO400 battery operaterd carbon monoxide alarm with battery back-up. The CO alarm features an electrochemical CO sensor to alert you to dangerous carbon monoxide and plugs into any standard electrical socket. A clear， 85-decibel alarm sounds when CO levels become hazardous. The alarm features an end-of-life warning that lets you know when it is time to replace the unit. The 10 year battery photoelectric smoke alarm detects smoke from slow-burning， smoldering fires while keeping false alarms to a minimum. The simple twist-lock mounting system installs easily into a wall or ceiling. *

• Brand Name: First Alert
• Power Type: Battery-Powered
• Sensor Type: Electrochemical
• Product Type: Smoke and Carbon Monoxide Combination Pack
• Battery Size: AA
• Batteries Included: Yes
• Low Battery Indicator: Yes
• Packaging Type: Clamshell
• Number in Package: 2 pk
• UL Listed: Yes
• Test and or Reset Button: Yes
• Color: White