Aetertek AT-215 Rechargeable Dog Pet System Vibration Electric Shock Training Collar Remote 500M For 2 Dogs training. Corrective shock or vibration can be used for one dogs or two dogs; Strong vibration to get any dog's attention,for 2 dogs training Rechargeable water-resistant receiver collar with long and short prongs for all coat types Range of up to 600 yards (approx. 550 meters) and signal can pass through obstacles, such as walls and fences 1 Year manufacturer warranty