The NONO RE functions with either safe static mode or vibration mode to correct unwanted barking behavior. Working closely with top-notch dog training professionals, we have algorithmized NONO RE’s training modes into a progressive training pattern to optimize bark control. The ultra-low voltage static design will not harm your precious dog, while vibration can be used for more sensitive dogs. The all-new NONO RE bark control collar comes in smaller, lighter, and better. That means less burden on your dog and more effective hands-free training for a reliable and well-mannered dog. With NONO RE, less actually is more. The NONO RE has five adjustable barking sensitivity settings to cater to dogs with different barking volumes. No matter how loud your dog barks, the NONO RE can recognize the barking behavior at once. A high-performing bark control collar is responsive to nothing but your dog’s barking. The NONO RE intelligently filters out other noises, such as other dog’s barking—to avoid sending unintended commands to your dog. The NONO RE, featuring a compact and minimalist design, is suitable for dogs of various sizes. The bark control collar will fit dogs with neck circumference between 8 and 22 inches. Please note that the collar is not suitable for puppies under six months old as they are too young for external stimulation. Never bother with battery replacement again. A rechargeable lithium battery is built-in with the NONO RE. It takes only 2 hours to fully charge the collar via a micro USB cable (included) from any relevant power source—PC, laptop, portable power bank, Android device charger, etc. The NONO RE has extended battery life. A smart chip is inserted in the bark control collar so that it enters power-saving standby mode intelligently. Less trouble of recharging the collar frequently, more quality time with your furry friend. Do not hang the dog leash directly on the collar, so that the two electrodes of the collar will be too close to the dog’s skin and may cause the dog to be injured.only for dogsonly for dogsThis product is a professional dog training device and cannot be used for other purposes. Please do not violate local laws when use this product.