Range of up to 600 yards (approx. 550 meters) and signal can pass through obstacles, such as walls and fences; 7 Levels of progressive shock (adjusts both in intensity and duration); 7 Levels of adjustable vibration (adjusts number of vibration bursts); 7 Levels of adjustable ultrasound (adjusts number of beeps); Can be upgraded to a 2 or 3 dog training system by adding one or two collars; Environmentally friendly: Rechargeable collar receiver, save money on buying replaceable batteries;