Bark Control Device (Upgraded) ADJUSTABLE SENSITIVITY and MORE EFFECTIVEThis dog bark controlling device stands out from others as it allows for more control. There are 4 modes of sensitivity using the adjustment buttons. You can set the detection to be less sensitivity in case of false triggers. The device has been tested and works well in restraining dogs and training them. MODERN LOOK and NO BATTERIES NEEDEDThe 2019 version features a new modern design that fits in well with other household items. It has a unique fan design with the sides sanded for a better grip. Its very durable and requires no batteries. Simply charge it and itll be charged for up to 30 days. 100 percent SAFE FOR DOGS and NEAR PEOPLEWe put the safety of animals and people as our top priority. Our device is safe for dogs and other pets of any size. It is safe to use as the ultrasonic frequencies are harmless to animals and cant be heard by people. APPLICABLE TO ALL SIZES OF DOGSUltrasonic dog deterrence comes in three different levels: high, medium, and low power that are suitable for small, medium and large dogs. You can manually adjust the frequency of the bark box using a simple knob. We recommend you start low and increase power as needed.