This citronella refill is to be used with the Multivet Citronella Spray Anti Bark Collar. All you need to do is insert the canister into the collar and then you are back in business. Each canister should provide the collar with around 250-300 sprays, before another refill is needed.
How to use the Mulitvet Citronella Refill?
To [...]

The Multivet bark collar lithium battery is to be used in the anti-bark spray collar deluxe and other products that uses this 3-volt lithium battery. This is the perfect replacement product for the bark collar that is used to prevent the dog from barking and causing a disturbance.
The battery is very simple to use, all [...]