Dogtra Super X 2 Dog Training Collar Professional grade Excellent durability &amp; dependability designed for extreme training conditions Rheostat intensity dial that allows for gradual adjustment in stimulation intensity Rechargeable 2 hour rapid charge Lithium polymer battery Illuminated LCD screen displays exact level of stimulation clearly &amp; accurately Precise stimulation level (0-27), 1 mile range 'Nick", "Constant" and non-stimulating pager/vibration, 2-hour rapid change lithium Polymer batteries, Fully waterproof collar/receiver and transmitter, LCD screen displays exact level of stimulation even in dark or low light conditions, Three bar battery life indicator Precise stimulation level (0-27), 1 mile range 'Nick", "Constant" and non-stimulating pager/vibration, 2-hour rapid change lithium Polymer batteries, Fully waterproof collar/receiver and transmitter, LCD screen displays exact level of stimulation even in dark or low light conditions, Three bar battery life indicator