A car s speakers make for effective alarm systems as they can be used to measure variations in air pressure.
													
																	Air pressure car alarm. 
								
	
		
	
																	The avs air pressure sensor detects a sudden change in air pressure from inside the car to the outside environment caused by fast intrusions such as a door being forced opened or a car window broken. 
																	Pressure monitor and alarm. 
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																	This simple external solution features a light optional audible alarm that s designed to grab the attention of qualified personnel anytime pressure is rising too high or falling too low in a system. 
															
													
								
	
		
	
																	This same system can work in reverse which is what happens in a basic pressure detector. 
																	With a rubber hose driveway alarm or driveway bell or doorbell the alert or alarm signal is transmitted to a receiver when a vehicle rolls over the driveway air pressure sensor sending a signal to the transmitter which in turn will send a wireless alarm signal to the receiver. 
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