An e-collar recommended for training small to mild-mannered dogs. It has rheostat intensity dial for precise stimulation level (0-127) and has Nick, Constant for stimulation type with a non-electrical stimulating Pager/Vibration. It also has blue LCD screen display with a tri-color LED battery life indicator. Both collar/receiver and transmitter are fully waterproof, cover a ½ mile range and uses low to medium power. This unit contains a rechargeable Ni-MH batteries with aone-charger system to charge the Transmitter & receiver at the same time. This unit comes with a rechargeable, user-replaceable Ni-MH batteries and and one-charger system allows the transmitter and receiver(s) to be charged at the same time. Ideal for dogs that weigh 20 lbs or more, This would include Bulldog, Labrador Retriever, German Wirehaired Pointer , English Cocker Spaniel, Welsh Springer Spaniel and dog of similar kind.