You love your dog. With our Cujo Control No Bark Collar your dog will be silent during the day, out at the park, and throughout the entire night. Peace and quiet at last. Safe, effective, humane. Your dog is wonderful. What’s In The Box – 1 tone/shock receiver – 1 nylon collar with adjustable strap – 4 contact probes (2 small, 2 large) – 1 test light – 1 6 volt alkaline battery – 1 instruction booklet Bark Collar Specifications – Adjustable sensitivity settings – 7 levels of tone and shock stimulation – Safe for 8-120 pounds dogs – Collar length 6-28 inches How It Works At the first bark, the Cujo Control bark collar applies a short warning tone. If a second bark occurs within thirty seconds, it applies a more intense warning tone. On the third bark, another intense tone is applied along with a short, mild shock. This pattern is repeated through 7 correction levels. The first 2 levels are only with a warning tone. If your dog continues to bark through the next 5 levels, the intensity of the sound and shock will progressively increase after each bark. If your dog stops barking for 30 seconds between correction, the anti bark collar will automatically reset to the first “tone only” level of correction. Most important though, to us, is the customer service you’ll receive when you place your order today. All we ask is that you give us a shot and if for any reason at all it doesn’t work for you, you have your entire lifetime to let us know and we’ll give you 100% of your money back – no questions asked!