Key Feature That Make It a Great Collar for Training:
Annalog Controls in easily accessible locations making it easy to switch between dogs and adjust stimulation levels without taking you eye off the dogs. 
Reliable and Range out to 3/4 mile.
Continuous and Momentary Stimmulation.
Good Range of Stimulation Levels. 
Expandable up to 3 Dogs.
 
Additional Features:
LED Light on Dog Collar that Turns on with Remote.
Bark Collar Functions on the Collars.
Tone and Vibrate Functions.