This battery-operated device uses ultrasound to teach your dog not to bark. A sensor detects whenever the dog barks, and the Bark Trainer then emits a series of ultrasonic whistles, only audible to the dog. · The dog will usually learn to associate barking with the unpleasant noise, which should reduce or even eliminate ‘nuisance’ barking.. · Adjust the unit to react only to your dog’s barking. · Simple to use, and harmless to your pet. · No harmful chemicals or pesticides · Battery operated (3 x LR44, supplied). · Average battery-life 30-50 days. Product Barcode: 5014055001306 Product Dimensions: 170 x 190 x 40 mm Product Weight: 90g Inner Quantity: 1 Outer Quantity: 12 Pallet Quantity: 1296 (12 outers per layer x 9 high) Pallet Weight: 133KG Waste Packaging: Product: 10g paper, 64g plastic Secondary: 276g paper, Outer: 1,234g paper