Kidde Battery Operated Wireless Interconnect Smoke Alarm  RF-SM-DC - 0919-9999 Enables quick and easy installation of an interconnected smoke alarm system without messy wiring or labor. Temperature Range: 40 degree Fahrenheit to 100 degree Fahrenheit When one alarm sounds, they all do: wireless technology uses radio frequency to both transmit and receive messages about a hazard in the home Battery power enables homeowners to install interconnected alarms without rewiring Smart touch button quickly and temporarily silences nuisance alarms Wireless alarm can be installed in a detached workshop or shed