2 Pack Bark Collar, Rechargeable Dog Bark Collar for Large Medium Small Dogs, Smart Training Collar with 5 Adjustable Sensitivity Beep Vibration Harmless Shock, Anti Barking Device for Dogs5 Humane Training Modes Our automatic bark collar offers 5 modes to gently correct excessive barking. You can choose beep, vibration, or a combination of both, and there's also a shock option for the more stubborn barkers. Progressive training helps your dog learn effectively without causing harm, ensuring a positive experience throughout. 20 Days Standby Fast charging lets you say goodbye to long waits while enjoying up to 20 days of battery life.