Remote training dog collar to train your dog remotely with a range up to 600 yards (approx). 550 metres);; Adjustable levels of shock to fit the needs of dog training; one strong vibration, humane effective approach to get your dogs attention or stop barking or other undesirable behaviors; One beep tone correction; Can be upgraded to a 2 or 3 Remote Dog Training Collar systems by adding one or two dog collars