Dogtek Additional Dog Collar For Electronic Dog Fence System

"> Add an unlimited amount of these waterproof DOGTEK receiver collars to your EF-4000 Electronic fencing System.You may also like product image GROOVYPETS 650 Yard Remote Dog Shock Collar Training Collar for Small Medium Large Dogs, 3 Training Modes, Sound, Vibration, Shock Rechargeable 100% Waterproof -2 Dog Model.