"You are looking at a remote control dog training shock & vibrate collar. Its a 4 functional [Instant Static Impulse + Static Impulse after Vibration (warning before static impulse) + Whistle Signal + LED light] remote training collar. It's is an electronic dog training system with a working range up to 800 feet. This compact, easy to operate system will control bad behavior and dogs who run off when taken outdoors for exercise. Is your dog out of control? Are you finding it difficult to train him/her using orthodox methods? You are not alone. Many dogs simply do not respond to traditional training methods which is why thousands of owners and professional trainers have used training collars to assist them in their training programs. As we all know an out-of-control dog can be a danger to themselves and others. Training collars can help you achieve a well trained and contented dog within days. This collar is the best sulotion for small, medium dogs, not for those up to 100 pound."