Function: 1.Straight line distance measurement 2.Golf compensation distance (recommend the best golf ball parabolic distance) 3.Angle switch (turns slope compensation on and off for tournaments) Unit support: M/Yard Flagpole Scanning and Flagpole Locking: Measure the background first in golf mode, then press and hold the measurement button for a long time without releasing, scanning from far to near to the flagpole will show the distance to the flagpole. And there will be a vibration prompt. AAA battery (PRC). The Golf Rangefinder supports replaceable batteries. And these batteries are very easy to purchase at your local store. This is one of the very few models on the market that supports this battery.