DOGTEK No Bark Citronella Spray for Dogs END ANNOYING BARKING: Utilizing a proven method to train your dog not to excessively bark, the DOGTEK No Bark Spray Collar is one of the most effective No Bark collars available on the market. The anti-bark device sprays when you blow into the microphone, but it wont spray when your dog barks. NO HUMAN INTERACTION NEEDED: The No Bark Spray collar is able to automatically sense your dogs barking, so it does not require any human involvement beyond refilling the unit. FITS SMALL, MEDIUM, AND LARGE DOGS: The collar strap fits neck sizes up to 24 inches in circumference. A GENTLE YET EFFECTIVE SOLUTION: The No Bark Spray collar offers an alternative method of training from the usual tone-based or shock-based collars. An advanced microphone receiver detects barking, causing the collar to release a brief burst of specially formulated No Bark Spray. The burst of citronella spray acts as a distraction to your dogs attention, deterring them from continuing to bark. Remove all other collars when using the anti-bark device 1 YEAR WARRANTY: DOGTEK is a brand you can trust! We offer a 1 year limited warranty on all of our products.