Easy-to-use ergonomic transmitter. Rheostat dial allows for gradual increases in stimulation intensity with no jumps between levels 0-127. 1/2-mile range. Stimulation type - nick constant and nonstimulating pager/vibration. Rechargeable user-replaceable ni-mh batteries. Fully waterproof collar/receiver and transmitter. No external antenna on the collar/receiver. One-charger system allows the transmitter and receivers to be charged at the same time. Over 999 different identity codes to prevent signal match-up with other e-collars. Easily visible blue lcd screen displays exact level of stimulation and can be seen in the dark or low light conditions. Three bar battery-life indicator and led colored indicator to show remaining battery life.