The dog bark collar offers 3 working modes that are customizable with 7 adjustable sensitivity levels, allowing you to select the mode (beep, vibration, or shock) and sensitivity level that best suits your dog's temperament. With this bark collar, you can find the most effective way to curb your dog's barking without causing them stress or pain, gently correcting their barking issues Quick Charge& Long Battery Life: NBJU Bark collar recharge with high capacity battery, it can be fully charged in 30 mins for up to 15 days of work time, this device has a long enough battery life so you don't have to recharge the batteries frequently