Good question. The rangefinder works totally independent of the smartphone in the field.
First you press the RANGE button on top to wake up the unit. A second press of the button gives you a range reading which displays for about 2 second, then your vertical correction is displayed in either MOA or Mils, and finally your windage adjustment is displayed. The Kilo continues to cycle through those three readings until you press the button again or it shuts off. The Kilo sleep timer is user adjustable from 15-180 seconds with the phone app.
Here are the three displays you will see after you range a target.
Range
Elevation correction
Windage correction