Features: 1.With 7?level sensitivity adjustment, it is an efficient behavior modification tool that will help you train your dog to bark less. 2.Can be easily charged with the USB cable. 3.It's tinier, lighter and comfortable for dogs. 4.Whether your dog is a small dog or a large dog our adjustable dog bark collar can fit them just fine. 5.The collar is waterproof ? it works well even if immersed in water. Specification: Features: With 7-level sensitivity adjustment, it is an efficient behavior modification tool that will help you train your dog to bark less. Can be easily charged with the USB cable. It's tinier, lighter and comfortable for dogs. Whether your dog is a small dog or a large dog our adjustable dog bark collar can fit them just fine. The collar is waterproof - it works well even if immersed in water. Specification: Condition: 100% Material: Plastic+Nylon Size: Approx.6.7*4*3cm /2.64*1.57*1.18in Battery: Built-in 300mA lithium battery Charging Method: USB charging Adjustable Diameter Range: 6-35cm Voltage: DC 5V Pet Size: All Size Weight: 95g Color: Blue Instructions: 1. Lightly press to turn on, long press to turn off, 7 levels of sensitivity adjustment, 3 indicator lights at the same time, 7 levels, 1 to 6 levels and so on. 2. Function key adjustment, you can turn off one of the functions, or work at the same time. 3. The following select product vibration function principle: When dog bark is triggered for the first time, the warning sound is emitted, the working indicator light is on automatically, and the vibration is the weakest output, the dog will respond, the product automatically resets the start mode, if the dog does not respond, enter the next function mode.The dog bark is triggered for the second time, the warning sound is emitted, 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 the next function mode.By analogy, the dog bark is triggered for the seventh time, the warning sound is issued, the finger lights are turned on automatically, the vibration is super-intensified, 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 automatically stops working. The working mode will automatically restart after 1 minute, or you can press the switch button to restart. Package List: 1* Dog Training Collar 1* USB Cable 1* User Manual Notice: 1. If the dog's hair is too long, it is recommended to cut it short to avoid affecting the vibration of the product. 2. Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. 3. Please understand that colors may exist chromatic aberration as the different placement of pictures. 4. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.