Kidde 30CUAR Hardwired Combo Smoke & CO Alarm AA Battery Backup Interconnected Nuisance Alarm Reduction 10 Year Life Packs:3 Pack Ideal for sanding metal for Ideal for sanding metal for repainting or prior to the primer coat conference tables remain free from cables and do not require using a fixed table for your clients Electrochemical (CO) Power Source 120V AC with 2 AA Battery Backup Hush Feature Temporarily silences nuisance alarms Interconnect Capability Connects with up to 24 Kidde devices End of Life Notification Alerts after 10 years of operation Smoke Alarm Warning 3 long beeps and red LED flash CO Alarm Warning 4 quick beeps and red LED flash Low Battery Alert One chirp and amber LED flash per minute Audio Alarm 85 dB at 10 ft Operating Temperature 40°F to 100°F (4 and reorganized HTML specification chart provide a clear and practical overview of the Kidde 30CUAR Smoke + Carbon Monoxide Alarm