PetSafe SSSCAT Spray Replacement can for PetSafe SSSCAT Spray (Motion Detector Unit is NOT INCLUDED) Quick and easy to replace, 80 to 100 sprays per can Safe, unscented, harmless spray surprises your pet, reminding him to stay away from the off-limits area Compatible with both SSSCAT Motion Detector Units PPD00-16168 and PDT00-13914 To replace can make sure switch is set to off ("O" positions), place the motion detector unit on top of the spray can and firmly slide down the locking ring until it clicks into place Call, chat or email with our expert PetSafe US-based customer care specialists six days a week; They are waiting to assist you and your pet with your product needs Manufacturers warranty is only valid when purchased from an authorized retailer