Thanks to the bark and vocal cord vibration detection devices, it is activated only by the dog wearing it. At the first bark, 6 beeps are emitted. After the sound signals, the collar delivers electrostatic stimulations, with different levels of intensity depending on the dog's response to the sound warnings. We recommend use on dogs at least 6/8 months old, starting with just the ultrasounds, and then moving on to weak or medium impulses. Dimensions: 5x4.6x3.6 cm. Strap and 3V battery included, battery life about 6 months. Adjustable collar: from 20 cm to 67 cm. Gross weight: 250 grams. Made in France.