Kidde announced three new home safety devices that it says respond to dangerous conditions 25 percent faster than the competition: A battery-powered smoke detector, a battery-powered smoke and carbon monoxide detector, and a hardwired smoke/carbon monoxide detector with voice alerts and a 10-year backup battery. The Kidde model 20SDR Smoke Alarm operates on two AA batteries (included) and utilizes a photoelectric sensor to detect the presence of smoke. An onboard LED glows green to indicate the detector is powered, amber to report a fault or error state, and red if smoke is detected. It sells …