Innotek Digital Advanced Trainer, 300 Yards Advanced remote trainer with 300-yard range for dogs 6 months or older Receiver collar delivers electronic stimulus; collar fits neck sizes 8 to 21 inches Hand-held transmitter with 7 stimulation levels, including tone-only button Digital display indicates current level; low battery indicator; waterproof design Receiver measures 2-1/7 by 1-1/5 by 1-2/3 inches; transmitter measures 1-3/4 by 5/8 by 3-1/2 inches; limited lifetime warranty