The Economy Bark Control Collar is the simplest and one of the lightest bark control collars available! When your dog barks, this anti-bark collar gives a warning beep and mild correction. Then if he continues to bark, he will receive the warning tone with a slightly stronger correction. This process will continue up through six levels of correction. The collar senses the vibrations in your dog's throat that happen only during barking. While not at all harmful, the Economy Bark Control Collar is an effective deterrent to excessive barking. No overseas shipping for this Item.