The New Dogtra EDGE RT is designed for the most demanding training environments. 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 our 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.Stimulation/Combination buttons User Expandable to a three-dog system'Nick' and 'Constant' stimulation along with a non-stimulating pager/vibrationRechargeable 2-hour rapid-charge Lithium Polymer batteryLow to High power stimulationFully waterproof transmitter and receiver/collarIntensity selection dial stimulation level (1-8)1-mile rangeExtendable contact points (5/8" to 3/4")Warranty - 2 Year Limited Lifetime WarrantyPower - Low to HighBatteries - Lithium PolymerLCD Screen - NoCarrying Case - YesExpandable - Yes, up to 2 additional receiversPager Mode (Vibration) - Yes Includes: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) Carrying case