I got four of em and I love them! Good battery life, easy to change batteries, green light flashes when collar is on, when the battery has less then 100 hours of life left the light will blink red to let you know. Three of mine are led but I never use them because I am afraid the it will spook the hog or make the dog easy for the hog to single out
I know its not likely but always in the back of my mind so I leave them off. I also like that you can take the tracking unit off of the collar and replace the collar your self if need be with four screws, all you need is a new collar and a leather punch and you are good to go.
Matt
