YUYIKES Aluminum Thumb Knob Stainless Bolt Nut Screw(color blue) UPGRADED 2018 SENSITIVITY CHIP - As a result of using Dog Bark Collar for small and medium dogs, we have upgraded chip to be more humane and less sensitive. Finally you can get on top of your dog's uncontrollable barking, ultimately making you and your dog happier. AUTOMATIC MODE. Put the anti bark collar in automatic mode and let its smart design do the rest! The dog electric shock will play the warning tone and then administer a Level 1 impulse. If your dog continues to bark, the sensitivity will increase through all five levels. Once barking stops for at least 30 seconds, the anti bark collar resets. Should barking continue at Level 5, the no bark collar turns off for 1 minute to ensure safety. CORRECT YOUR POOCH NO MATTER THE SIZE: The adjustable collar and raft of sensitivity settings mean the no bark collars can successfully correct dogs weighing anywhere from 6 to 120 pounds. The strap has a length of 73 cm, it is perfect for small, medium and large dogs. You will also receive extra electrodes to be able to use the collar for short-haired and long-haired dogs SOLID GENERIC CONSTRUCTION - This new & improved No Bark Collar is certified according to IPX5 Waterproof Standard. Now you can walk your pet in rain and in wet weather and to be sure that the device will work. SATISFACTION GUARANTEED: Our team of professionals is constantly working to make you happier with fully bark control. We are confident in the quality of our product and give you a money back guarantee within 30 days.