False alarm
The armed alarm is protected against the following:
- Knocks to the car
- Shaking or vibration of the car
- Wind load (external pressure waves)
- Automatic switching on/off of any electrical equipment in the car.
- External noise
- Changes in the internal/external light intensity
- Air flows and turbulence inside the car.
- Temperature changes inside the car.
- Fan noise from original extra heaters inside the car.
IMPORTANT:
This assumes that all doors/hatches and windows to the passenger compartment are closed.