First Alert Combination Smoke and Carbon Monoxide Alarm with Battery Backup

Features: Detects both smoke and carbon monoxide Uses ionization technology and features an electrochemical sensor Large, simple to use silence/test button emits low battery warning Features tamper resistant locking pins for increases safety Includes universal mounting bracket Latching alarm indicator lets you know it's working 120V AC hardwired with 9V battery backup to ensure nonstop protection Includes 7-year limited warranty Specifications: Length: 5.6 Inches Width: 1.9 Inches Height: 5.6 Inches Weight: .7 Pounds Battery Backup: Yes Additional First Alert Links Browse all First Alert Products