Considered more humane but just as effective as other training methods, this patented collar controls a dog's excessive barking with a harmless mist. A spray unit attached to the collar has a built-in microphone that triggers a startling non-toxic spray each time your dog barks. The canine quickly associates the spray with its behavior, causing him to curtail his nuisance barking whenever he wears this collar. The unscented water-based solution is hypoallergenic and ozone friendly. The collar's reservoir holds 25 applications and it comes with a 300-application refill. The included three-volt battery lasts up to four weeks. For dogs 8 lbs. and up. The sturdy nylon collar is 27" L. Spray unit is 2" H x 1 1/2" W x 1 1/4" D. (10 oz.)