Safer Humanized Setting: The dog bark collar has 4 working modes; 5 adjustable sensitivity levels. Just press the M button at any time to enjoy quiet time. Please refer to the user manual before use for optimal performance and safety | Automatically Stop Dog Barking: FAFAFROG bark collar for large dogs is equipped with an upgraded smart dog barking recognition chip with 2 activation conditions: bark and vibration from vocal cords(No remote) | Protect Mode: The smart color display clearly shows the working status and power level; If the dog bark collar has been activated 6 times continuously, it will stop working for 30 seconds (the digital display changes to "8"), protecting your dog from unnecessary activation | Fast Charging & Waterproof: The bark collar for medium dogs features new charging for simple operation and more stable charging; A full charge in 2 hours works for about 15 days; The bark collar for large dogs has an IP67 waterproof design, so you can enjoy training time with your dog in the pool, park, beach, or backyard | Fits Most Dogs: Our bark collar is 27 inches long and weighs 0.17 lbs, suitable for dogs weighing 8 to 150 lbs with neck sizes from 8 to 25 inches, and is ideal for dogs over 6 months old. The length can be adjusted as your dog grows