To refill the collar, make sure the unit is turned off. Hold the spray can upright and firmly press the nozzle down into the refill port. Hold for 15 seconds and remove. If spray leaks out, you may need to press harder to complete the seal. 300-400 spray refills per can Citronela spray Stain-free Environmentally friendly Soft spray stops barking 25-30 sprays per refill For dogs of any size Water-resistant