A week ago I had a blow our on my 41 foot toy hauler. I have the TST 507 system. If I set the monitor in my cup holder, after 5 minutes I get a beep that the monitor has lost connection with a sensor, usually from the back right axle. If I place the monitor on the dash, I do not lose communication with any of the sensors. When the tire blew, it took about 5 seconds for the alarm to sound. I do not have a repeater installed. It is my understanding that the sensor sends an update once every 5 minutes. If an update is missed, then you should get a beep.