The new Dogtra YS600 is a fully-waterproof (IPX 7) anti-barking collar designed with mid to high-level output for large to very-large size stubborn barking dogs. The Dogtra YS600 features vibration plus 10 manual adjustable intensity stimulation settings that provide a wide range of output for any type of disposition, including even the most persistent barking dogs. The Dogtra YS600 bark control collar is rechargeable with the new 2 hours fast charge battery. Operating Modes Non-Stimulating High-Performance Pager/Vibration (P) The Dogtra YS600 will vibrate twice when the dog barks. It will not emit any static stimulation. The Pager is great for well trained and sensitive dogs while the dog knows vibration follows by static correction if the dog doesn’t stop barking. Stimulation Intensity Levels (1-10) The Dogtra YS600 will vibrate once prior to set static correction while the dog barks. This Self – Learning Vibration System that helps the dog to understand the association between vibration warning and static correction. Testing Mode (T) In the Testing Mode, the Dogtra YS600 bark control collar will only vibrate when it is activated. The bark detecting sensor will be in high sensitivity setting to activate the collar more easily for testing purpose. Sensor: The Dogtra YS600 anti-barking collar integrates a vibration bark sensor to detect the barking. When the dog barks, the vibration from the voice box triggers the sensor. So only the dog wearing the collar is able to activate it. The accelerometer bark sensor has self-learning barking pattern of the barking dog, it is recommended to put the collar on charge first when attaching the collar to another barking dog. This recharging process could reset the bark sensor for a different barking dog. The Persistent Bark Indicator The Persistent Bark Indicator/LED light activates when the collar is turned off. – Without excessive barking: The LED will flash red for 2 seconds when the collar is turned off. – With excessive barking: The LED will flash green for 10 seconds when the unit is turned off. In this case, it could mean that the stimulation intensity level is set too low. This could also mean that the collar is not fitting on properly and need to make sure to the collar has a proper fit and both contact points are touching your dog’s neck.