(Low to high power) Fully-waterproof no-bark collar designed for medium and large breeds, with the same reliable electronics found in the popular Dogtra e-collars. Features Activates from the vibration of the dogs' vocal cords Receiver weight 7.5 ounces for medium to large breeds Convenient dial that controls the ON/OFF function and the seven intensity levels LED battery life indicator Fully waterproof Package Contents Yapper Stopper with collar strap Rechargeable battery & charger Test tool Owner's manual