ABOISTOP TRAINING COLLAR (STANDARD) FOR DOGSAboistop dog training collar Kit provides a humane & harmless way to help control nuisance barking. The Aboistop Kit comprises of a nylon webbing, adjustable collar with a unit mounted on it, a battery & a refill canister containing oil of citronella. The Aboistop dog training collar Kit uses an electronic sensing unit to release a brisk jet of citronella towards the dog's chin when he barks. The combination of smell & noise will distract the dog & stop barking. The Aboistop Kit is used to control problem barking. At each bark, the collar releases a spray of natural citronella oil, that surprises the dog. He will stop the unwanted behaviour & try to locate the source of the strange smell. Gradually he will learn that when he smells the scent, he is forbidden to bark. Aboistop products are humane & harmless, this is NOT an electric shock collar. Aboistop is said to be highly effective & it comes with a two year manufacturer's guarantee.* Helps stop nuisance barking* With electronic sensing unit* Automatically releases spray of citronella* Humane* Harmless* Highly effective* Two year manufacturer's guarantee The difference between the Aboistop Standard & Compact Collars is: Aboistop standard training collar weighs 125 grammes & the Aboistop compact training collar weighs 80 grammes. The Aboistop compact Collar is designed for the smaller dog but can be used by all sizes.