SD12 Standalone Photoelectric Smoke Alarm Key Features: * Worry-free! 10-year battery life * Advanced photoelectric sensing technology offers high sensitivity * Auto-check malfunction * Low battery warning * Manual Test & Auto-Reset SD12 Standalone Photoelectric Smoke Alarm Specifications: * Sensor Type: Photoelectric * Alarm Sound: >85dB (3) * Power Supply: DC 3V lithium battery (included) * Power Supply Life: 10 years * Alarm Current: