The most recent update to the AARST Radon Mitigation Standards requires all radon mitigation systems to have an audible alarm to alert the homeowner if their radon mitigation system stops working. PressureTech’s Radon System Alarm is the ideal solution for all your radon system installations. The alarm is quick and easy to install with no wiring or extra hardware required. Just attach it to the system and insert the air tube into the pipe. Once the alarm is switched on, it will constantly monitor the airflow and vacuum pressure inside the pipe and sound a 130 decibel alarm if the air pressure or suction drops to zero.