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").