Dogtra Edge Remote Controlled Electronic Dog Training Collar System features interchangeable rheostat intensity dial or 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 level of stimulation, mode, and a 3 bar battery life icon; plus waterproof transmitter remote and receiver collar with a one-mile range and interchangeable contact points for various coat lengths. Expandable to a 2-, 3-, or 4-dog system with color-coded add-on collars (sold separately). System includes transmitter remote, one receiver collar, charger, metal belt clip, and case. For medium to large dogs (20 lbs.+) Manufacturer model #: EDGE. Interchangeable rheostat intensity dial or step dial stimulation Stimulation types in nick, constant 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 level of stimulation, mode, and 3 bar battery life icon Submersible, waterproof transmitter remote and receiver collars One-mile range Interchangeable contact points for various coat lengths Expandable to a 2-, 3-, or 4-dog system System includes transmitter remote, one receiver/collar, charger, metal belt clip, and case Dogtra Edge Remote Controlled Electronic Dog Training Collar System Add-On Receiver/Collars sold separately and can be found through item search for number 1896216