Innotek Rechargeable Basic Remote Trainer Basic remote trainer provides a fast, easy way to a better-behaved dog 1-ounce, 1-button transmitter with 7-level flexibility and tone-only option Receiver delivers electronic stimulation; collar fits neck sizes 8 to 21 inches 250-yard range; maintenance-free rechargeable NiMH batteries Receiver measures 2 by 1-1/4 by 1-1/2 inches; transmitter measures 1-1/4 by 1/2 by 2 inches; limited lifetime warranty