Regular fire alarms are great, if blind panic helps you feel safer. “Hey! Wake up! BEEP BEEP BEEP! There’s a deadly emergency going on somewhere in your house! Guess where? BEEP BEEP BEEP! Or maybe it’s a false alarm! Good luck figuring it out! BEEP BEEP BEEP! And here’s a deafening noise to help you think it through! BEEP BEEP BEEP! BEEP BEEP BEEP! BEEP BEEP BEEP!” Oh, definitely, they’re better than nothing. And they’re worse than these First Alert ONELink Smoke and Carbon Monoxide Detectors. These, my oxygen-reliant friend, are not your run-of-the-mill smoke-sniffers. For one thing, their electrochemical carbon monoxide sensor will remind you if you’ve left your Hummer running in the dining room. For another, its photoelectric smoke sensor won’t get all frantic about a little shower steam or some burnt toast. So there goes the “boy who beeped ‘fire’” factor that plagues lesser detectors. But the feature that really comes in handy when your house is full of smoke is the ability for multiple alarms to wirelessly link up, so when one goes off, they all go off. And then they tell you, in plain English, where in the house the smoke-detecting or CO-huffing unit is located. If you’ve ever stumbled blindly into a burning kitchen, you’ll know this is nothing to cough at. If you’re in a life-or-death situation, and the only person around to help you is your non-verbal, easily excitable friend, well, you take whatever help you can get. But wouldn’t you wish you’d brought along the articulate friend who only gets upset in moments of actual crisis? That friend is waiting for you now. Its name is the First Alert ONELink Smoke and Carbon Monoxide Detector Two-Pack. And unlike your other friends, it’ll never make unkind remarks about your haircut or weight. You need a REALLY fancy smoke detector for that. Warranty: 5 Year First Alert Features: 2 in 1 protection, detects smoke and carbon monoxide Talking alarm with location; When programmed, a voice will tell you the location of the unit if smoke or carbon monoxide is detected OneLink enabled alarms communicate with other OneLink alarms wirelessly. When one sounds, they all sound No additional electrical work needed, capable of linking up to 16 OneLink detectors Photoelectric smoke sensing alarm, helps prevent false alarms like those caused by cooking fires and shower steam Electrochemical CO sensor, the most accurate technology available for detecting carbon monoxide when compared to other common sensing technologies Loud 85db alarm Mute button, mutes unnecessary alarms immediately Easy Access battery drawer, no need to remove the alarm from the ceiling to change the batteries Operates on 2 AA batteries In the box: 2 First Alert ONELink SCO501CN Smoke and Carbon Monoxide Detectors 4 AA Batteries 2 Sets of Wall Mounting Screws Discuss this product Less