Dogtra Element 1/2 Mile Training Collar Has All The Basic Components Needed For Successful Behavior Management Of Mild Mannered Dogs Features A 1/2-Mile Range Rechargeable Batteries & A Fully Waterproof Receiver & Transmitter Transmitter & Receiver Both Use Rechargeable Nimh Batteries, Included, 100 Levels Of Rheostatic Dial Nick & Constant Stimulation Ensures There Are No Gaps Between Levels Reduced receiver/collar designed for smaller dogs, Precise stimulation level (0-100), 1/2 mile range 'Nick", "Constant" and non-stimulating pager/vibration, Rechargeable, user-replaceable Ni-MH batteries, Fully waterproof collar/receiver and trasmitter, LED battery life indicator