Xcellent Global 2 Dog Training Collar Battery Remote Control With Shock and Individual Vibration For Each Dog F-PT006 Batteries required. Will work with dogs from 15 to 100 lbs. 900-1300 feet range transmitter (with no interference) Correct your dog individually with a shock and vibration or correct 2 dogs at the same time with a vibration Water-resistant collars(Not water-proof)