Tera Wireless Rechargeable Water Repellent Bark Stop Control Shock Vibration Dog Pet Training Collar with 300m Remote Range 100 levels of vibration. 100 levels of static. Operating Range: Up to 300m / 984 feet (no obstacle and interference) The system can be used for 1 or 2 receivers. Rechargeable design is energy saving. Following the correct operational instructions, you can effectively train your pets in a short run.