I call it “The cool but impracticable Wrist Device”
just thought id share since people at work seem to be amazed by it
it has a toggle button that cycles through WATCH/FLIGH LIGHT/PULSE READER modes.
it has a variable resister knobs for LCD brightness as well as for contrast.
has a buzzer attached to pin 13 so when a heart beat is detected it beeps powered by an arduino nano clone and a 9v battery.