The Kidde HD135F is a 120VAC Wire In Heat Alarm that responds to temperature rather than smoke. The alarm will sound if temperatures rise about the 135°F. The Kidde HD135F interconnects with up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms. This unit includes a 5-year limited warranty and is UL Listed.
The Kidde HD135F 120VAC wire in heat alarm gives you and your family an early warning to dangerous temperatures of 135°F or more. This unit can be used as a single station unit or it can be interconnected to up to 24 Kidde devices in a multiple station arrangement. The interconnect system should not exceed the NFPA interconnect limit of 12 smoke alarms and/or 18 initiation alarms. The HD135F includes a tamper resistant pin to help deter tampering or theft.
Features:
- Interconnectable Interconnects with up to 24 Kidde devices.
- Test Button Tests units electronic circuitry, horn and battery function.
- 9V Battery Back Up Provides continuous protection even during power outages.
- Red LED Flashes every 30-40 seconds to indicate proper operation.
- Low Battery Indicator Alerts user in the event of a low or missing battery.
- Quick Connect Power Harness Makes installation fast and easy
Technical Specifications:
- Power Source: 120VAC, 60HZ, 9V battery backup
- Sensor: Heat
- Audio Alarm: 85dB at 10ft
- Temperature Range: 40°F to 100°F (4°C to 38°C)
- Humidity Range: 5%-95% relative humidity (RH)
- Dimensions: 5″ in diameter x 2″ depth
- Interconnects: Up to 24 Kidde devices
- LED: Red, AC power present, alarm mode
Warranty: 5 year limited warranty

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Not sure that this is true:), but thanks for a post.
Have a nice day
Saurooon