Color：Silver Black Gray
Operating Range：16.4 ft (maximum effective range)
Battery：AAA Alkaline Battery X4
Product Dimensions：4.33*1.26*1.38 inches
Product Weight：3.28 oz
It is made with ultrasonic technology. When the dog barks, press the start button and the speaker will release ultrasonic sound to stimulate the dog and make it feel uncomfortable. After this repeated for a few times, the dog will learn that it´s barking will bring uncomfortable feeling to itself. By so, it will always think of this when it wants to bark.