STAND ALONE : Smoke + Heat +Gas (X-Sense DS31)
X-Sense DS31 10-Year Battery Lifetime Smoke Detector Fire Alarm with Photoelectric Sensor

• KEEP YOUR LOVED ONES SAFE: The DS31's photoelectric sensor is not only great at detecting fast-burning flash fires (that most smoke detectors are designed to catch), but is also excellent at noticing slow-burning fires that take a long time to develop. This provides an increased level of safety for your family and loved ones
• IMPOSSIBLE TO IGNORE OR SLEEP THROUGH: The powerful 85 dB alarm shipped with the DS31 will get even the soundest sleepers out of bed
• DON'T WORRY ABOUT BURNING DINNER: Are you tired of smoke from your latest kitchen misadventure setting off the smoke detector again and again? With the DS31, there's no more need to wave the broom around or pull the batteries; just hit a button on the front of the housing to silence it
• NO MORE REPLACING BATTERIES: Nothing is more annoying that trying to track down the chirping noise in your attic when the smoke alarm's battery is dead again. That's why we designed the X-Sense DS31 smoke alarm with an incredible 10-year lithium-ion battery life
• MOUNTING HARDWARE INCLUDED: Install the X-Sense DS31 fire alarm quickly and easily as soon as it arrives. Mounting bracket, screws, and anchor plugs are all included in the DS31 smoke detector's packaging