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Introducing Kidde's Heat Alarm Thermistor Red LED - your early warning system against fire. This reliable device detects heat before it reaches the fixed temperature rating of 135F and sounds an alarm to alert you, giving you time to evacuate safely. With its originating alarm indicator light and power-on LED, you'll always know when it's time to act. Interconnect up to 24 units with other Kidde interconnectable smoke and CO alarms for maximum protection. Ideal for commercial or residential use, the Heat Alarm Thermistor Red LED provides peace of mind and security in any setting. Trust Kidde to keep you safe from harm.