At the first bark, a beep sound is emitted. If another bark is detected within 30 seconds, a beep sound and a static stimulation are emitted light, progressive or strong according to the selected operating mode . If your dog stops barking during 30 seconds, at the next bark, the collar will start its operating cycle from the beginning beep sound only . The stimulation function can be inhibited selecting beep sound only operating mode. Four operating modes are available so you can adjust the product to your dog beep sounds only, beep sound light stimulation sensitive dog , beep sound progressive stimulation, and beep sound strong stimulation difficult dog . Features n Battery life approx. 3 monthsn Weight 77 g battery included 2.71 ounces n Dimensions 60 x35 x 37 mm 2.36 x 1.38 x 1.46 n Power 1 3-V CR2 Lithium battery supplied n Blue washable strap length 68 cm 26.77 / width 18.5 mm 0.73 €“ adjustable for neck sizes from 17 up to 55 cm 6.69 to 21