First Alert Precision Detection 10-Year Battery Smoke/CO Alarm, 3-pack

Features:

• Advanced Precision Detection technology
• Precision Detection less nuisance alarms and an earlier warning to the most common types of fires
• 2-in-1 Protection from Smoke & Carbon Monoxide (CO)
• Meets UL217 8th Edition Smoke Standards
• Meets UL2034 4th Edition Carbon Monoxide Standards

Includes:

• Advanced Precision Detection Technology
• 2 alarms
• 2 Mounting Brackets
• Owner’s manual

Specifications:            

• Operating Voltage: 120V AC 60Hz with 3V alkaline battery backup (two 1.5V)
• Dimensions: 5.0” diameter x 2.0”H 
• Weight: 9.3 oz