Because it takes more than just field work to train dogs, SportDOG® has a great solution. With a 450 metre range, seven instantly selectable static stimulation levels with low/medium modes plus tone and vibration options in every mode of operation, DryTek(TM) waterproof design technology and batteries that recharge in two hours, this just may be the ideal training solution for your animals. The SportTrainer excels in all environments and is especially suited to upland and 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 and receiver collar. With SportDOG® Add-A-Dog® extra receiver collars (purchased separately), the system can easily be expanded to control up to 3 dogs, even without losing the vibration and tone stimulation options for each dog.