Dogtra, 1 Dog Electronic Dog Collar, Perfect For Training Your Puppy Or Building Retrieving Skills, Ultra Compact System, Designed For Dogs As Small As 10 LB, With Nick & Constant Stimulation Modes, Along With A Non-Stimulating High Performance Pager, Nick Is A Momentary Burst Of Pre-Measured Stimulation, Constant Gives Electrical Stimulation For As Long As You Hold The Button Down, Up To 8 Seconds & Page Causes The Collar To Vibrate For Non-Electrical Stimulation, Hand Held Transmitter & Receiver/Collar Features 2 Hour Rapid Charge Batteries, Along With A 1/2 Mile Range, Set Is Fully Waterproof, LCD On The Transmitter Displays The Remaining Battery Life & The Exact Level Of Stimulation Output.