* ✿ SIZE ✿ 33 to 52 Cm * ✿ AUTOMATIC BARK CONTROL COLLAR ✿ With no electric shock, this DAONLY Collar deters barking by emitting sounds and vibrations at seven intensity levels. Effective, painless, easy and safe training of your dog; with adjustable leash length to different sizes. * ✿ PROGRESSIVE LEARNING ✿ In the first two intensity levels, the necklace only emits sound. In addition to the tone, from the third level it emits a vibration that increases in level every thirty seconds. If the barking continues, the emitter stops for one minute in total SAFETY for your pet. * ✿ ENERGY SAVING BATTERY ✿ This DAONLY bark collar includes a 6V battery that is very easy to replace and energy-saving.