Petist No Bark Shock Collar, Electronic Dog Anti Bark Collar, No Harm Sound and Shock Control Pet Training System for Small, Medium and Large Dogs Safe & effective: Petist no bark dog collar sends warning sound and harmless static stimulus to stop Easy to use: Simply slip it around your dog's neck, adjust the collar length and the system is ready Adjustable nylon collar: Unique bark terminator and lightweight collar (78g), designed for dogs' neck Buy with confidence: The Petist collar has been a proven solution to stop excessive dog barking