The Spray Control citronella spray refill can is compatible with any PetSafe spray bark control collar or spray remote trainer collar. For barking, when each time your dog barks, the anti-bark spray collar releases a spray of harmless citronella that interrupts the dog's pattern of barking. Over time, most dogs will be gradually conditioned to stop barking. The citronella spray is safe and effective, providing a humane way of ending your dog's cycle of nuisance barking. This liquid also helps you manage your dog's behaviour in the remote spray trainer. Press a button on your remote controller and the collar releases a burst of citronella spray towards the dog's snout. A few timely corrections with this spray can be very effective for changing the misbehaviour or teaching some basic obedience commands. With a content of 75 ml, this spray can has about 40 refills for a bark control collar.