The TSD201 connects to the RSP100C Respiration Amplifier to record respiratory effort. The transducer measures the changes in thoracic or abdominal circumference that occur as the subject breathes. The design presents minimal resistance to movement and is extremely unobtrusive. Due to its novel construction, the TSD201 can measure arbitrarily slow to very fast respiration patterns with no loss in signal amplitude, while maintaining excellent linearity and minimal hysteresis. The transducer comes with a shielded 3-meter cable and an adjustable Velcro® strap to fit a wide range of subjects.