Our dog shock collar features 4 humane training modes: beep(standard), vibration(1-9 levels), safe shock(1-99 levels) and Shock Boost(10% higher). Enables you to set the right stimulation levels for your pet, which is helpful in deterring dogs from undesirable habits. The dog training collar covers up to 2000FT allowing the dog to roam farther, making it easy to train your dog indoors or outdoors. With dual-channel, one remote supports 2 receiver collars, and you can train 2 dogs at the same time! Besides, it has a memory function without resetting it.