PetSafe Citrus Spray bark Collar helps stop excessive barking the safe and humane way using a gentle spray rather than a shock! The Spray Control Anti-Bark Collar is simple to operate. Place the battery in the receiver collar and attach it around your dog’s neck. When the vibration of your dog's bark triggers the sensor probe, a burst of lemon-scented spray is emitted to deter the barking. While not harmful, it is a sufficient deterrent to excessive barking. Features: * Uses vibration sensor to sense for barking * Cannot be set off by another dog's bark * All-natural lemon scent is safe and effective * Waterproof * Low Battery indicator * Low Spray Indicator * Emits up to 80 sprays per refill * Uses a 6-volt silver alkaline battery (included) * User Manual Included * Manufacturer's Lifetime Warrantee