HNW1094 Features: * Smoke alarm * Photoelectric sensor and battery backup * Convenient silence / test button * Dust cover * 85 Decibel alarm * Alarm indicator identifies which unit triggered alarm * Inter-connectable with BRK and hardwired smoke and carbon monoxide alarms * Very effective at detecting smoldering fires before it goes up into flames Includes: * Includes 9 volt battery Warranty: * Manufacturer provides 1 year warranty