This is a great choice for mild mannered dogs that do not require a high level of stimulation. For dogs 15 lbs or greater. Features include a 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. System includes: one transmitter, two receiver collars, a battery charger and splitter cable and an owner's manual. Precise stimulation level (0-127) Reduced receiver/collar designed for smaller dogs 1/2 mile range Nick', 'Constant' and non-stimulating pager/vibration Rechargeable Ni-MH batteries