First Alert Hardwired Smoke and Carbon Monoxide Alarm, 3-pack

Features:

• Wireless interconnect
• Ionization and electrochemical sensing technology
• Universal mounting bracket
• Side-load battery compartment
• Test/silence button
• Battery back-up (included) to provide continuous protection during power outages

Specifications:

• Dimensions (L × W × H): 12.7 cm × 5.08 cm × 12.7 cm (5 in. × 2 in. × 5 in.)
• Weight: .36 kg (0.8 lb.)