Many devices make use of indicator lights to draw attention to themselves.  Indicator lights are a simple way to let a person know the status of an activity. Whether it’s the light from a Fitbit letting you know how you are progressing or letting you know you need to push yourself father to reach your fitness goals.  Or perhaps a Blood Pressure Monitor like the Omron line that let you know if you have an irregular reading so you can go an consult your physician.  Indicator Lights have found a niche in our lives.