Safe Ultrasonic Feature: The vibration of barking will activate the machine issued ultrasound, make your dog feel uncomfortable, so not to bark.1.The ultrasonic sound is 100% harmless.2.The Dog Collar straps are elasticated with an buckle.3.The Bark Stop Collar is an advanced behaviour modification device designed to help train your dog to stop excessive barking.4.The Dog Training Collar is activated through the bark vibration of the dog wearing collar. This Dog Bark Collar eliminates interruption from another dog.5.Collar is an advanced behaviour modification device designed to help train your dog to stop excessive barking. Dog Collar eliminates interruption from another dog. You can truly enjoy the outdoors with your pet, and eliminate nuisancebarking. 6.Simply adjust collar to appropriate size for your dog's neck and put it up. Use On/Off button to turn it on/off.7.You can now truly enjoy the outdoors with your pet, and eliminate nuisance barking.Description: Color: WhiteQuantity: 1 PcsWeight: 40gSize: Longest: 11.5", Shortest: 7", Width: 0.5" (Adjustable stretch collar to fit different sizes)High Button: Setting the collar on this setting will set the sensitivity of the unit at higher settings, which means even soft bark will cause the unit to activate.Low Button: Setting the collar on 'Low' setting will only activate the unit when more aggressive bark occurs.Audible: Audible will allow everyone to hear the unit activate. This setting is recommended for testing.Ultrasonic: This is the recommended settings for daily use. This unit will emit ultra-sound only your dogs to hear. Your dog will feel uncomfortable and stop barking.Principles of Operation:It will detect the vibration of the dog's bark.At the first bark, the unit applies a short warning tone.If a second bark occurs within 30 seconds, a more intense tone is sounded.If your dog barks a third time, the tone are made more intense. If your dog continues intense sound are applies after each bark until your pet stops for thirty seconds terminator automatically resets to the first "tone only" level of correction.At each step, your dog gets to choose whether it is worth the increasing pain to bark again.(The same step of Ultrasonic mode) Trouble Shooting:If collar appears not to be working, try the following.1. Adjust the collar to fit.2. Recharge the battery.3. Check that the probes are touching the dog’s skin.4. If necessary, trim the dog’s hair or use the longer probes to ensure proper skin contact.