BRK Electronics First Alert SA3210 Dual Sensor DC 10-Year Sealed Lithium Battery Powered Photoelectric and Ionization Smoke Alarm

10 year sealed tamperproof battery powered combination photoelectric and ionization smoke alarm. 10-Year Lithium Power - 10 years of continuous protection. No battery change required. Tamperproof Sealed Alarm - Powercell cannot be removed. Photoelectric and Ionization smoke sensing technologies Silence feature End of Life Signal provides audible notification alarms needs to be replaced 10-Years Limited Warranty Model# SA3210 Weight 8.4 oz Operating Voltage 3V Lithium Power Cell Temperature Range 40°F (4°C) to 100°F (38°C) Humidity Range 10% to 95% relative humidity (RH) Audio Alarm 85dB at 10 feet Test/Silence Electronically simulates smoke condition, causing the unit to alarm. Press and hold test/silence button. Alarm Reset Automatic when smoke clears Smoke Sensor Photoelectric & Ionization Listing Listed to UL217 Standard