Dogs bark for many reasons but in most cases, the barks can be a source of stress for the owners and their neighbors. When the dog barks, the Bark Control Soft EYENIMAL emits ultrasound and / or vibration. Ultrasound will emit an harmless but annoying beep tone, to distract the dog from barking. Vibration near the larynx help to interrupt the barking. Dogs eventually learn not to bark and completely avoid stimuli. Low battery indicator beep sound indicator. On/Off and mode selection with a magnetic key. waterproof. Battery life 90 days on a basis of 12 hours use and 24 triggers a day . Dimensions 64 x 30 x 25 mm 2.52 x 1.18 x 0.98 . Power 1 3-V CR2450 Lithium battery supplied . Turquoise nylon strap length 64 cm 25.19 €“ adjustable for neck sizes from 17 up to 55 cm 17 to 21.65 . Features n Ultra light €“ only 52 g 1.83 ounces n No static stimulationn 3 operating modes Ultrasounds, Vibrations, and Ultrasounds vibrationsn Triggered by the vibrations of the dog €™s vocal cordsn Adjustable bark detection sensitivity