The Sport Trainer 450M range Remote Trainer excels in all environments and is especially suited to upland & multi-dog hunting situations. The palm-of-the-hand sized model is designed for field training and hunting with close-working dogs and features waterproof/submersible technology for both the Remote Transmitter & Receiver Collar. The collar offers up to 7 levels of continuous and momentary static stimulation. Vibration and tone-only stimulation options are instantly available in every mode. The system can easily be expanded to control up to 3 dogs. The batteries recharge in only 2 hours.