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The Kidde Fire Sentry Battery Operated 4" Smoke Alarm Model i9040 utilizes ionization sensing technology to provide an early warning signal to you and your family in the event of a fire hazard. Installation is easy, no wiring required and the large trim ring will cover up paint rings when replacing 5" alarms. Test button feature verifies that the detection electronics are working properly. This unit is UL Listed and includes a 3 year limited warranty.