An advanced dog training system for professionals. Twenty-one levels of continuous and momentary vibration and tone settings for control up to one mile away. Train up to 3 dogs (system includes one black collar; additional red and blue collars, sold separately). Easy-access design allows "no look," one-handed operation so you can watch your dogs as you move between levels and switch dogs. Remotely operated beacon lights on the dog-collar device help locate your dog in low light. An add-on locating beeper is also available. BarkLimiter helps quiet nuisance barking when off the field. Fixed transmitter antenna won't get lost or broken and delivers up to a one-mile range. The dog device is water-rated to 10 meters. The PRO 550 transmitter is waterproof and floats. Color-coded dog pairing system, make it easy to determine which dog is receiving stimulation. One size fits most. Imported.