The EDGE is a fully customizable/expandable e-collar designed for professionals and serious amateurs. Features Interchangeable Rheostat intensity dial or Selector "Step" dial stimulation Stimulation types in Nick, Constant, and a non-stimulating Pager vibration mode Built in high intensity LED lights on the receiver/collar 2-hour rapid charge Lithium Polymer batteries LCD screen displays exact level of stimulation, mode, and a 3 bar battery life icon Fully waterproof transmitter and receiver/collar 1-mile range Expandable to a two, three, or four-dog system Interchangeable contact points for a variety of coat lengths Package Contents Transmitter Receiver/Collar Battery charger and splitter cable Test light Owner's manual Exchangeable selector dial Contact point extensions (2) and adjustment tool Metal belt clip and screws (2) Carrying case