POP VIEW Dog Bark Collar for Small, Medium, Large Dogs, Anti Bark Collar with Sound and Vibration, No Shock, Harmless & Humane SAFE & HUMANE - We know you love your best friend but their barking is an issue. So our POP VIEW no bark collar is a great way of training using only sound and vibration, and is safe to wear inside and out complying to the highest safety standards. PROGRESSIVE TRAINING - To prevent stress the anti bark mechanism is delivered through 7 progressive levels of sound and vibration. This ensures that your dog receives the minimum amount of stimulation required to prevent barking. SENSITIVITY ADJUSTMENT - You can control the level of barking required to activate the collar allowing you to find the perfect setting for your dog. Your dog's wellbeing is our number one priority and we have ensured that this collar is packed with features allowing you to tailor it for your dog's needs SUITABLE FOR ALL DOG SIZES: Ideal for dog breeds weighing from 11 to 120 lbs or neck size 7 - 21 inches. You can according your dog necksize to adjust the suitable length.will not be a burden to your dog COMMITMENT TO EXCELLENCE: 90 Days Guarantee! We promise and guarantee the best customer service by providing a response to any questions, concerns, and inquiries within 48 hours. NOTE: If there's anything we can do to make your buying experience better, we certainly will. Simply contact us through Amazon's Buyer's Messaging System. We are here to help!