Specification:Item Type: Dog Bark CollarMaterial: Plastic, Nylon WebbingProduct Size: Approx. 6.5 x 2.5 x 3.1cm / 2.6 x 1.0 x 1.2inColor: BlackBattery Type: Lithium Battery (Shipped with Built in Battery)Battery Capacity: 300mAhCharging Method: USB Charging Range of Collar: Approx. 6-35cm / 2.3-13.7inWaterproof Grade: Life Waterproof, Can Be Rainproof, Can Not Be Soaked in WaterSuitable Pet Type: Large, Medium and Small DogsProduct Function: Warning Sound + Vibration + Sensitivity AdjustmentHow to Use:1. Lightly press to turn on, long press to turn off, 7 levels of sensitivity adjustment, 3 indicator lights at the same time, then it is 7 levels, 1 to 6 levels and so on.2. Function key adjustment, you can turn off one of the functions, and you can also work at the same time.3. The following select product vibration function principle:When the dog bark is triggered for the first time, the warning sound is emitted, the working finger light is on and automatically turns on, the vibration is the weakest output, the dog will respond, the product automatically resets the start mode, if the dog does not respond, enter another function mode.The dog bark is triggered for the second time, the warning sound is issued, the finger lights are turned on automatically, the vibration output, the dog responds, the product automatically locks the second mode, if the dog does not respond, enter another function mode.By analogy, the dog bark is triggered for the seventh time, the warning sound is emitted, the indicator light is on and the light is automatically turned on, the vibration is super intensified, and the dog responds, and the product automatically locks the seventh mode automatically.The warning sound output mode is the same as the vibration output 7 times mode, the first time is the shortest, and the seventh time is the longest. If the dog still has no response, the product will automatically stop