The Ranger by Zeus Anti-Bark Collar for small dogs safely and humanely helps reduce excessive barking with the gentle use of sound and vibration-pain free & shock free. This collar offers a choice of two different training modes (sound or vibration), which allow you to select the mode that best works for you and your dog. The sound mode emits a high frequency sound that deters dogs from barking; the vibration mode releases a vibration every time your dog barks. Low and high settings allow you to adjust the level accordingly. The Ranger by Zeus Anti-Bark Collar is an excellent way to curb your dog's excessive barking. This collar is also available for large dogs. Key Features : Lightweight, adjustable collar Snap buckle for easy fastening Water Resistant For small dogs 3.6 kg to 11.3 kg (8-25 lbs), neck size 17.7 cm - 35.5 cm (7in - 14in) Adjustable collar with snap buckle 2 modes (sound and vibration), 2 settings (low and high) Batteries included (3 x L44 1.5 volts) Visit www.hagen.com/zeus-ranger for more information on how to fit the collar, training tips and much more.