Whether you're a professional trainer or a serious amateur, the RT offers the simplest solution to the most complex training. The RT transmitter gives you a 'no look' one-hand operation, so your eyes are always focused on your dog. The 8 levels of Nick and Constant stimulation coupled with Dogtra's Combination Buttons, offer a wide range of stimulation for every dog and every training situation. Features include - 1-mile range, rapid charge batteries, hard travel case and a fully waterproof collar/receiver and handheld transmitter. Contents: Transmitter, Receiver/Collar (1) - Additional Receivers sold separately. 5/8"contact points, which are standard-and contact point washers(included) that allows the points to be extended to 3/4"). Battery charger and splitter cable, Test light, Owner's manual, Contact point, extensions (2) and adjustment tool, Metal belt clip and screws (2) and Carrying case. Rechargeable 2-hour rapid-charge Lithium Polymer battery 'Nick' and 'Constant' stimulation along with a non-stimulating pager/vibration User Expandable to a three-dog system Fully waterproof transmitter and receiver/collar Intensity selection dial stimulation level (1-8)