In-ground/ Underground/Invisiable Waterproof Electronic Dog/pet Fence with Two Dog Shock Collars(A Dog Training Whistle Clicker Included) Water resistent and rechargeable Collar For all dogs(&gt;25lbs) with update version, and most reliable Up to 2500 square metre range Low battery indicator - When the light on the collar is green, it is working properly Items also include a Dog Training Whistle Clicker