This is a great choice for mild mannered dogs that do not require a high level of stimulation. Features: 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 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 Includes: Transmitter Receiver(two collar receivers for dogtra two-dog models) Battery charger and splitter cable Owner's manual