The old machines, the Hill-Rom 103 machine, was the most noticable piece of equipment. Seriously, there was this white light inside the blue on button. It was REALLY REALLY BRIGHT. And then the dials, which went from a Pressure of 1, to ten, a Hertz/Frequency from 5 to 25 Hz, 300 to 1500 Pulses Per minute, and a timer on the machine. This vest was obviously clunky and Whilst it's not as commonly used in home care, you still see them in hospitals.