Compact Smart System: The PetSafe NanoBark Collar is an ultra-lightweight, waterproof collar with Perfect Bark tech to detect and respond only to your dog's bark for precise, humane barking correction Customizable Training: Auto-adjusts through 10 stimulation levels for safe, effective bark control in multi-dog households; adjustable collar fits dogs with neck sizes less than 13 inches Reliable Dog Collar: Rechargeable, durable, and travel-friendly with a battery life lasting up to 40 hours per charge, this collar is ideal for indoor training or outdoor adventures with small dogs Global Mission, Local Care: With U.S. roots and worldwide reach, PetSafe delivers vet- and trainer-recommended solutions and exceptional customer support to create fields of joy for pets 25 Years of Trust: Since 1998, PetSafe has created safe, innovative, and trusted products that bring joy, enhance pet lives, and support the lifelong bond between pets and their families