The inductance of the inductive belt is exactly proportional to the cross section area of the band's closed loop around the body. It therefore changes as the patient breathes. The electronics in the Inductive Interface Cables measure these inductance changes to generate a signal that is an accurate and reliable replication of respiration waveforms. Use with any SleepSense Inductive Belt to connect to any system that is compatible with inductive effort sensors. Designed for use with Alice 5 systems.