Using your PetSafe SSSCAT Spray Pet Deterrent Refill Can is easy. First, make sure your PetSafe SSSCAT Automatic Spray Pet Deterrent is properly set up in the area you want to protect. When the original can runs out, simply replace it with this refill can. The motion - activated sensor will detect your pet's movement within 3 feet and release a spray. Remember to place the deterrent in a spot where it can effectively cover the off - limit area. As for maintenance, keep the can in a cool and dry place. If the spray seems to be not working properly, check if the can is empty or if the sensor is blocked. This odorless spray won't damage your furniture or floors, but avoid spraying it directly on electronics. Enjoy using this product to train your pets and keep them away from places they shouldn't be.