Gift 4Us No Bark Training Electronic Anti-Bark Dog Collars from PetGoPro - Sound & Electric Static Shock E-Collar, Safe & Humane, Easy to Install, 7 Levels of Sensitivity for Small, Medium, and Large STOPS BARKING SAFELY: The training collar progressively increases sound and shock. FIRST bark is a short warning sound. SECOND bark is an intensive sound. THIRD bark will provide intense sound with a mild shock. The pattern is repeated through 7 levels. Dogs learn to stop barking SAFE & EASY TO USE: The collar has an adjustable, high-quality nylon collar that easily adjust from 6 to 30 to fit small, medium, and large dogs. A 6 Volt battery included 2 SAFE HUMANE TRAINING MODES: 2 safe humane training modes (beeper & static shock) provides effective results 2 FREE Bonus E-Books Included. 1. How to Stop 10 Dog Obedience Problems 2. The 20 Top Dog Health Problems & How to Prevent Them 100% CUSTOMER SATISFACTION GUARANTEE: We offer a 90-Day 100% Customer Satisfaction Money Back Guarantee. If you are not happy with your purchase, then return the item and we will refund your money