The 1/2 Mile Dogtra Dog Training Collar is especially designed to be used for pet training or sport dog training. This Dogtra Training Collar can even be used by K-9 officers where high output stimulation is required. The 1/2 Mile Dogtra Dog Training Collar is fully waterproof and it covers a half mile range, which allows you to train and hunt in harsh elements. The settings on the Dogtra Training Collar are easy to see and the receiver is fully rechargeable with nick, continuous, and pager vibration modes. The Nick setting provides a momentary burst of pre-measured stimulation; the continuous setting gives electrical stimulation for as long as you hold the button down, up to eight seconds; and the page setting causes the collar to vibrate for non-electrical stimulation. This 1/2 Mile Dogtra Dog Training Collar System is designed for mild manner dogs that require a high level of stimulation. The 2 Dogtra Dog Collar Package includes two collar receivers, one transmitter, rechargeable Ni-MH batteries, and a user"s manual. Dogtra Element 1/2-Mile 2 Dog Training Collar: * Designed for mild mannered dogs * Precise stimulation level (0-100) * Reduced receiver/collar designed for smaller dogs * 1/2-mile range * Constant and non-stimulating pager * Rechargeable, user-replaceable Ni-MH batteries * Fully waterproof collar/receiver and transmitter * LED battery life indicator * Model# 302M